DTMF-16 - CircuitWerkes
Contents
1. D4 ve IG er Z Opto Disable GND R19 SLM Dual Tone 270 Mode 16 Decoder N 1 Li 4 y om CircuitWerkes DTMF16 L tose Ko 2T 10k 10 R14 270 U3A 1 16 5 1 ES 1 ys H 15 R5 4 44 x KZ 13 1m x 7 10 T ve i HK 3 579MHz 1 uUac 5 12 R4 6 m K 11 47k 1 T vec 1 1 1 ua 1 nM BOE m 1 10k D4 DS 52 2 15 XIN 08 D4 53 1 ipn ST 55 Lu 7 13 WI e IN GT TN 56 5 Hac Te MCT 45436 52 i 5 12 17 TO DSUB 37 PIN sje 28 46 ys 11 FEMALE U4D 511 fA 7 10 v 13 He ey si4 i 22k S15 1 1 4514 1 1 1 USA _ 1 16 hse 1 1 4 TNe14 1 1 USB Gnd to Disable 1 a 12 1 1 Hi 13 n usc T 1 5 12 R ERES i E Kk 10k Jl Off for pelt 11 Momentary 1 USD Operation i 7 10 gt 1 1 is J2b 1 i CRI 2 beep enable 1 1 i 1 1 95 R7 1 On for N RAN 1 2 2 1 3 4 2N3906 10k 1 C 51 2 1 t0 3 k 1 Ta vec d R D6 A 1 JMPR2X4 RL pv LED H A voc 1 1 e mcs 1 1 47uF 12. St VWOSL peeoxe Fou SOSZ OHN a3ueuuang urs e se pasn satTdnoso0j4dg ZOSZ O3N 404 unurxey Pes pg jJ 2 Specific examples for interfacing the DTMF 16 to relays and TTL CMOS inputs can be found on page 9 Typical DTMF 16 output wiring nnnnnnn CircultWerkes 0000000 low to disable DTMF 16b Output Wiring switched data strobe hex data d gnd hex data c regulated 45 Vdc hex data b hex data a common emitter A D gt collector e emitter NOTE A Pin descriptions inside the dashed box are for units in which the related option boards have been installed The ComboLok Option Board is a piggy back or daughterboard that mounts on top of the DTMF 16 board The Silencer Board mounts beside the DTMF 16 board or above the AC 2 board on AD 16 models Please call us or your favorite CircuitWerkes dealer for details for more informationon z collector collector collector collector 10 See ComboLok or Silencer Instructions for information on how to 1 1 see not
3. f 1 USA Bes sn Rig ES 2 15 DUE 1 2M 1 i dm g it 16 T bep UZA 1 44 134 2 1 1 1 Ei 12 3 TEN 14 11 2 1 13 1 46 iid 4093 RS 1 i R11 4093 R21 470k l 5 i 12 22k 1 2M 2 2k t T 060 p5 1 i pale ig HII 10 Anti falsing filter 1 1N914 HI boas Ext Beep in 1 i IL ll USD Components RI2 8 C9 determine 1 R20 12 the duration of the acknowledge baep 3 11 increasing either value increases 13 duration of the tons 1 6M 4093 T C6 4093 1 AC INT US LM7805 voc Power P vo 9 Supply In Regulated 5Vdc Supply CirciutWerkes Tur Poner Pang ered 3716 SW 3rd Place Gainesville FL 32607 01 4 are 2N4401 or equiv Internet http www circuitwerkes com 352 335 6555 fax 380 0230 Capacitor c4 OluF deleted Title Capacitor 11 not used DIME TE Decoder Size Document Number EV U4 U5 amp U6 NEC 2502 or 2501 i ate December 9 1997 5heet i ef i qe T99uS rvr66 41 2egquej3des 7aqeqg J qwuny 4ueunoo ezris v serduex j 2551 Jgejdnoooa3dg ieordA A 6669 it E 6E6S LEE 706 0922 74 eilrt Sseure9 MS 9145 peadsssdg peor e se pasn aeidnooo4dg JAN AA JOA
4. 2 4 is received causing K1 to unlatch T 6 e 5 Use the second set of contacts on K1 for your switching ce K2 pin 22 on db37 or external V for relay 3 4 VV RELAY SPDT D1 S E 1N4004 37 S E 19 pin 21 on db37 or external supply ground 5 Volts at up to 75mA is available for relay power Gnd is pin 21 CircuitWerkes 3716 SW 3rd Place Gainesville FL 32607 352 335 6555 fax 380 0230 http www circuitwerkes com Title DTMF16 SAMPLE LATCHING RELAY DRIVER Size Document Number A REV Date May 11 1998 Sheet of REPAIR OR SERVICE INFORMATION In the event of the need for service or repair call CircuitWerkes at 352 335 6555 for a Return Merchandise Authori zation number RMA Then carefully package the unit along with a note of the problem and send it to the address below Clearly indicate the RMA number on the outside of the box We cannot accept returns without an RMA Be sure to include your address not a PO box telephone number and best time to call CircuitWerkes ATTN CUSTOMER SERVICE DEPT 2805 NW 6th Street GAINESVILLE 32609 CircuitWerkes Limited Warranty This product is warranted against defects for two years from date of purchase from CircuitWerkes and CircuitWerkes authorized distributors Within this period we will repair it without charge for parts and labor Proof of purchase da
5. open collector output appears on the unit s db37 connector Connections The power connection is made via 2 1 mm coaxial jack and will accept from 8 to 18 Vac A power supply is provided with each DTMF 16 however if you wish to supply your own it must be able to provide at least 150ma The DTMF 16 s audio connection is made via the 1 4 inch jack located next to the power connector The connector is a tip ring amp sleeve type with the tip amp ring making the audio path The audio input is an unbalanced input with an input impedance of approximately 10kOhms Audio input level should be between 0 1 and 5 volts peak to peak Each DTMF digit is assigned to an optocoupler For the 12 standard tones each optocoupler s emitter amp collector is available at the D37f connector The emitters of tones A D share a common output pin Whena tone is detected the resistance of the optocoupler drops to a few ohms which emulates a contact closure for most dc applications Most low or medium powered switching can be done directly from the optocouplers Computer or logic inputs can also be directly driven from the optocoupler outputs For higher Voltage higher current loads the optocouplers can drive most external relays A sample hookup diagram of a computer logic connection and a relay connection can be found on page 9 of this manual The optocouplers are polarity sensitive and will conduct in one direction only so the emitter should always be closer to n
6. relays Pin 21 is ground Larger external relays must be powered from an external supply CircuitWerkes Title DTMF16 SAMPLE RELAY DRIVER Size Document Number REV NOTES Never exceed 30 volts emitter to collector Some low current TTL or CMOS inputs may require use output chips are available from the factory at no cost of non Darlington open collector outputs Non Darlington Sample hookup of 1 output to pull logic input low User s equipment vec 1 1 Pullup 1 Resistor 1 internal to device 37 0 Collector 4 TTL or CMOS in gt 1 1 1 19 Emitter t al 1 Bee nr Size Document Number REV 11 5Vdc is on Optionally NOTES Always use a reverse biased de glitching diode on the coil of the relay s Maximum sink Sample hookup of latching slave relay on 1 output pin 22 of the db37 connector you can power the relay s externally current for the standard Darlington output is 150mA Relay K1 will latch whenever the output is activated momentarily This example is wired to operate with the 1 output but any output can be used K1 will pull in when DTMF tone is 26 received and will latch itself on D2 K1 1N4004 External relay K2 s normally closed contacts are used 3 d e eo to break the circuit when DTMF tone
7. sequence decoder or an anti falsing delay filter When the filter select jumper J 3 is setto the normal mode position 1 transistor q4 is always on enabling the outputs Q4 s primary function is to turn the outputs off when J3 is set to either of the two filter modes until the appropriate signals or timing have occurred Q4 controls the operation of all optocouplers by sinking the cathode buss to ground When J3 is set to the 2T mode position 2 the high going output of the 4514 chip must be sent via the tone select jumper J4 to c11 a luFcapacitor C11 charges during the output pulse but then suddenly discharges at the end of the pulse pulling u7b s input momentarily low U7b inverts the signal and causes u8 s output to drop low quickly discharging c12 via 46 amp r19 When 12 is discharged u8c goes high turning on q4 amp enabling the optocouplers Q4 remains on for a few seconds while c12 slowly charges viar18 When the filter select jumper is set to AF position 3 buffered high going DV from 1 is fed to the inputs of u8a causing its output to go low slowly discharging c7 through r20 When c7 is discharged the output of u8d goes high enabling the optocouplers through q4 The 4514 directly drives the 16 darlington optocouplers to saturation The Optocouplers are quad packaged for higher density board designs A PC Board silk screen legend shows which optocouplers are associated with their tones An onboard 5 volt regulated supply ea
8. DTMF 16c Touchtone Decoder CircuitWerkes Technical Manual CircuitWerkes 2805 NW 6th Street Gainesville FL 32609 352 335 6555 Fax 352 380 0230 http www circuitwerkes com 1992 2003 CircuitWerkes All Rights Reserved Allinformation contained within is proprietary Nopartof this manual may bereproduced or copied without the express written consent of CircuitWerkes Touchtone is aregistered trademark of AT amp T Description The CircuitWerkes DTMF 16 is an integrated Touch Tone detector and sixteen output decoder offering an optoisolated Darlington output for each of the sixteen standard DTMF tones Seperate emitters and collectors are available for each of the twelve common DTMF tones 1 9 0 and Seperate Collectors and a common emitter are brought out for DTMF Tones A B C and D The open collector Darlington outputs provide 5000 volts of isolation and are capable of sinking up to 150mA continuously emitter collector voltage should not exceed 30 volts These outputs along with 12 volts DC unregulated and various internal test and interface signals are available at the unit s D SUB 37 pin connector When interfacing the DTMF 16 s outputs to low Voltage dc lines such as computer inputs etc the optocouplers provide greater isolation and do not contain mechanical parts to wear out as with relays Itisnotnormally necessary or suggested to use external relays unless you are plan
9. Ty S Q9 9 aloo of a lo 8 e oB n jo 0 ol 1000 M m Attention tone selector J4 Used in 2 9 oeo baat 1109 conjunction with the two tone filter n 2 0 8 sje oleae jumper to select which DTMF tone n 2 Heri Cee will enable the decoder DO NOT 8 n ag jumper more than 1 tone at a time s o gt 01001255 n5 5 n 5 de M s 5 jo eo 58 B meo gt 3 lo 5 ole 0 85e orn m 9 DB 4 2 000 n o T 52 Fle 5 o 19 n fs o D oual 5 ayo nans o S 3 E x m ngs 00905 osaa o 9 2 aa v osmog 2778 z eeo ooo ng gt OE udi z B Ps efla UB 55 MINNS jo lo n Filter Set Jumper J3 Selects between olo Y 9 ce normal fast response mode two tone Y x JepJo u MO 104 8800 SE 8l 2 800 Bue Y 8 EL 9U0 419euuo9 17037 mode or anti falsing delay mode
10. e A below 1 1 use pins 2 3 4 amp 23 nnnnnmnrn Q 1995 CircuitWerkes A11 Rights Reserved 20 REPRE Optional ComboLok COMMON not ground Pin 2 See ComboLok Installation Manual for usage in resetting the ComboLok 21 SER Optional ComboLok UNLOCKED ground sink output 3 goes low when ComboLok is Unlocked 2 Wo E Optional Silencer Board AUDIO OUT BALANCED 4 Optional Silencer Board Audio OUT Balanced not Ground 4 25 6 a 27 o DB37F pinouts on DTMF 16a Decoder Board 28 1 30 12 31 13 32 14 15 34 16 35 7 e 36 ia 37 CircuitWerkes 43 East Blvd N Macclenny FL 32063 904 331 5999 or fax 331 6999 Title DTMF 16b Output Connector Wiring B Size Document Number REY Date March 16 1995 Sheet of 10 Sample hookup of slave The relay will operate whenever the output is active This example is wired to operate with the 1 output relay on 1 output NOTES Always use a reverse biased de glitching diode on the coil of the relay s Maximum sink current for the standard Darlington output is 150mA K1 External relay 3 LiB 14 7 6 eS o gt pin 22 on db37 or external V for relay le 1 D1 1N4004 37 19 Regulated 5Vdc at up to 70mA is available at pin 22 for powering external devices such as
11. egative or ground than the collector As with relay closures the individual optocouplers may be tied together in parallel if desired Care amp Feeding Generally the DTMF 16 may be placed anywhere other electrical equipment is in operation As always it is best to avoid extreme temperatures immersion or high impacts If you wish to clean the outside of the DTMF 16 use a damp cloth soaked in a mild soap and water solution Detergents alcohol or solvents may remove the screen printing or mar the case Theory of operation Input audio is capacitor coupled to the Motorola 145436 low power DTMF receiver The MC145436 requires only one resistor and one crystal for frequency reference The hexadecimal coded output is decoded by the CMOS 4514 4to 16 line decoder The hex coded BCD data is connected directly to the 4514 decoder but the data valid strobe pulse from the MC145436 drives the bases of two npn switching transistors 41 and q2 q2 s sole purpose in life is to be an inverter buffer of the DV pulse for the accessory header 2x4 pin header located beside the 4514 chip and the DV LED 01 more importantly pulls up the Follow pin pin 1 a k a strobe on the 4514 and turns on transistor q3 during the DV pulse When q3 is thus energized it pulls the INHibit pin pin 23 of the 4514 low enabling the chip to place a high on the output selected by the MC145436 s hex coded BCD data The high going outputs ofthe 4514 drive optocouplers u3 thr
12. g the interlocked latching mode the jumper must be in the norm position One of the most common trouble calls that we get is from users who have gotten a decoder with the filter jumper J3 set to either position 20r3 If you re having trouble with your unit check J3 s position first When set to the 2T position the two tone sequence decoder is selected In this mode a specific attention tone must be sent before each command For instance if the key is selected as the attention tone and you wanted to activate the number 1 output you would send 1 to the decoder You can select any of the 16 standard DTMF tones to act as the attention signal by placing a jumper on the appropriate pins of the 2x16 jumpers J4 located between U3 6 and U2 The two tone mode provides three possible advantages over the normal fast mode First it improves reliability by preventing false tripping from transient audio passages Second it allows you to add up to 15 decoders to an audio line each using seperate attention tones Lastly the two tone mode provides a slight level of security when used with telephone couplers The two tone mode can not be used if the DTMF 16 is in the interlocked latching mode Do not jumper more than one tone at a time While that usually won t damage anything the decoder also won t work properly if at all The second alternate mode delays detection ofthe DTMF tones for a fraction of a second The delay prevents the decoder from detectin
13. g transient audio passages containing valid DTMF frequencies from being decoded Thisanti falsing delay provides reliable detection of single DTMF tones that last for at least 1 2 second Several satellite news sports networks use long tones for signalling affiliate breaks and cues Neither filter mode is compatible with the latching output mode because the filters disable the outputs after a few seconds The remaining four jumpers labelled A D hex data are simply in the paths of the TTL level hexidecimal data outputs of the decoder they are normally installed in the open position at the factory In the closed position the hex outputs appear on the D 37F output connector If needed the jumpers can be removed and the corresponding four pins of the D 37F output connector can be accessed via the jumper header pins for other purposes For example special ComboLok options can be interfaced to the outside through these pins Mounting The basic DTMF 16 can be either desk or wall mounted Keyhole cutouts on the ears of the enclosure are provided for wall mounting Two optional rack mounts the RM 01 and RM 02 are also available for those who would like to mount or two DTMF 16s in a 19 inch rack cabinet Basic Operation The DTMF 16 requires no operator intervention It monitors an audio source until a valid DTMF tone orcombination sequence occurs then energizes the tone s corresponding Darlington output optocoupler The resulting
14. ning to switch AC Voltages or audio signals Correct polarity must be observed for the optocouplers to work Installation amp Operation Setup The DTMF 16 comes from the factory ready to use just hook up an audio source to the tip and ring the sleeve is left floating on the DTMF 16 s 1 4 audio input jack connect your equipment to the supplied DB37 male connector plug in the power supply and it s ready Typical hookup diagrams are supplied in the schematics section the end of this manual The DTMF 16 has several user configurable options that are set via internal jumpers The Mode jumper J1 when OPEN selects momentary decoder operation The momentary output is activated only forthe duration of the incoming DTMF tone When the mode jumperis closed the decoder is in interlocked latching mode When in latching mode the selected output remains activated until another output is selected The second jumper J2 enables the acknowledge beep when installed The acknowledge beep is fed back down the audio line amp and is intended to provide an audible signal to the operator when the DTMF 16 is used in conjunction with a telephone coupler to make a remote control The beep jumper is normally shipped in the open off mode when the DTMF 16 operates by itself The filter mode selectors allow you to configure your DTMF 16 for two alternate momentary modes In the norm position the decoder provides quick detection of DTMF tones If you are usin
15. ough u6 Diodes d2 and d3 connect the base of q4 and q3 to the enable disable pin of the 2 by 5 header and the disable pin of the d37f connector When either pin is grounded the decoder is disabled QI s high going trailing edge triggers the DTMF acknowledge beep circuit After Q1 turns off r8 pulls the the line low through Q5 Q5 is a gate controlled by Q4 so that no beeps occur until the second tone of a 2 tone sequence or if the unit is disabled by the combination lock option The 4093 s pin 1 u7a goes low for a short period of time determined by c9 and r12 after q1 s high going edge occurs which gates the oscillator formed by u7d u7c c8 r10 and r11 forthe duration ofthe pulse The resluting short burst of mdirange square waves is cap coupled to the audio input via jumper J2 so that any valid DTMF tones is followed by a brief acknowledge beep If the DTMF 16 is not being used in a situation where a confirmation that the DTMF tone was decoded is desired jumper J2 or J2b can be pulled to disable the beep When the decoder is set via jumper 1 to interlocked latching mode the base of transistor q3 is held high which pulls the INHibit pin of the 4514 low keeping the last selected output activated until a new DV pulse accompanied by new BCD data occurs Diode 41 prevents Vcc through r9 from flowing back through the buffered DV circuit when J1 is on The filter select jumper allows the user to select between normal operations a two tone
16. roblem with the 4514 chip an output chip or an internal jumper such as J3 If you suspect an output chip there are 4 identical chips each containing 4 optocouplers You can swap them around to test any particular output Note Excessive current or Voltage through the emitter collector junction of the NEC optocouplers will destroy them Options The Silencer option board combined with your DTMF 16 lets you recieve DTMF control signals while completely removing the tones from your audio path Your talent or producer in the field can fire ID s start breaks fully automated remote broadcasts light up an attention flasher or control just about anything else right in the program path without getting any tones on the air On channel Silenced DTMF tones easily allow for sophisticated network control without the expense of additional control channels The Silencer can be field retrofitted in this version of the DTMF 16 Contact your CircuitWerkes Dealer for more information on CircuitWerkes products DTMF 16C Layout Diagram Audio Input Connector Tip 4 and Ring Gnd Sleave is not used 10k unbalanced input J2 Acknowledge beep On Enable acknowledge tone Off Disable acknowledge tone Power input 7 to 24V ac or dc 37 pin D sub 9 output connector Hex data Db 37 output jumpers header Normally jumpered can be removed disabling the hex data o
17. sily handles the circuit s power needs TroubleShooting Problem No outputs function and there is no BCD data on pins 1 2 13 or 14 of the 145436 No DV LED Solution Power supply failure check bridge first improper audio input check the audio input jack to see if it s making proper contact with your plug Sometimes the jack s pins get bent out of place when plugging in bad MC145436 or damaged crystal Problem DTMF 16 outputs test good but won t activate my equipment Solution Polarities may be reversed Optocouplers will conduct in one direction only In some computer related cases a different version of the DTMF 16 output chip may be required replacements are available free from the factory Adding an external relay can also solve this problem Problem One or more outputs do not operate with an incoming tone Beep amp DV LED work Cause Failed optocoupler s failed 4514 bad q3 or 41 zotched Is J3 in the right position for your situation Try setting it to the normal mode pos 1 Distorted DTMF tone Problem No outputs will operate with an incoming tone no beep DV LED works Cause Q1 is fried Problem None of the outputs function with incoming tones 4514 outputs go high approx 1 2 V during appropriate tones DV LED lights during tones Cause Incorrectly wired output connector bad q4 or r14 open missing improperly placed or missing filter select jumper Problem None of the outputs function with incoming
18. te required Warranty does not cover transportation costs or a product subjected to misuse accidental damage alteration except as authorized by CircuitWerkes improper installation or consequential damages Except as provided herein CircuitWerkes makes no warranties express or implied including warranties of merchantability and fitness for a particular purpose Some states do not permit limitation or exclusion of implied warranties therefore the aforesaid limitation s or exclusion s may not apply to the purchaser This warranty gives you specific legal rights and you may also have other rights which vary from state to state 12
19. tones BCD data during incoming tone good at pins 1 18 17 16 of the but no output of 4514 Cause Incorrectly wired output connector pin 1 grounded bad 4514 bad q1 q3 or r3 r4 open missing Problem No beep Outputs functioning properly on db37 Cause 4093 failed Q5 blown or beep jumper removed The DTMF 16c has a red LED marked DV that should light whenever a tone is detected If you have problems check that LED for operation during a tone If it s not operating then there s an audio input problem with input jack plug or your wiring or the MC145436 chip associated circuit is bad If you have an amplified speaker listen to your source audio at the jack s wiring connector to verify that the audio is getting that far If the light does come on then hook up your external connectors in the normal way that they will be used and using a D C Voltmeter preferrably analog look at the two pins associated with the tone that you are using When there is no tone you should see Voltage from whatever source you re trying to switch Verify that the collector pin is high and that the emitter is low If they are reversed the unit will not work If there s no Voltage from your source then either your source is bad or your wiring is faulty If there is Voltage then verify that it s not more than 30 Volts and wait for a tone During the tone the Voltage should fall to nearly zero If it does then the decoder is working If not then there is a p
20. utputs sothatthe corresponding D Sub pins 2 3 4 amp 23 can be used by other assemblies in the product enclosure like the optional Silencer T1 optional see bottom of PCB If Installed Audio In n n o nu o B 3 0 B Y PowerLED 8 __ Oo o seo o L 4 1 10 0 y X Pwr e g PS Valid DTMF tone Bee 55 o NS 55418 o detected LED o Ass a ae 0 o 1 57 o eo o o o 8 528 v 2 o d8 J1 Mode Jumper 3 gt OSE 595 alo wu n BRIT meissa P 5 On Latching see text Puis 8 i Off Momentar 6 So al 925g amp 28 xx 4022 lg B 2 IST Y Soe goy y o e 259 O 250 gt jo e 2 n 9 roz 10 pin accessory header i 05 aloo o B tpe
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