Talkback Combiner PCB'S

[Igor]

Hi to all, here's the schematics, comp placement, etc for

Talkback combiner.

http://i251.photobucket.com/albums/gg291/diy33609/tb_comb_pcb.gif

http://i251.photobucket.com/albums/gg291/diy33609/tb_comb_sch.gif

http://i251.photobucket.com/albums/gg291/diy33609/tb_comb_pcb-1.jpg

http://i251.photobucket.com/albums/gg291/diy33609/tb_comb_assembled.jpg


Ordering:

http://www.groupdiy.com/index.php?topic=29771.0

BOM:

RESISTORS
1   1r       5% 7.5MM PITCH      R39
2   3R3      5% 7.5MM PITCH      R35, R40
5   75R       5% 7.5MM PITCH      R18, R21, R31, R34, R1
1   150      5% 7.5MM PITCH      R6
3   1k2      5% 7.5MM PITCH      R36, R37, R38                                  
3   4K7      5% 7.5MM PITCH      R2, R5, R8                                      
2   4k7      5% 7.5MM PITCH      R9, R22                                        
2   5k6      5% 7.5MM PITCH      R17, R30                                        
2   10k      5% 7.5MM PITCH      R12, R25                                                                          
10  20k      5% 7.5MM PITCH      R10, R11, R15, R16, R19, R23, R24, R28, R29, R32
1   *68K     5% 7.5MM PITCH      R4
                                   
CAPS

NON-POLAR
1   0.1u     63V         7.5MM POLY               C1
4   224 (47...220n)    5MM CERAMIC 50V      C19, C20, C21, C22
7   15P (10..22p)      5MM COG 50V             C6, C10, C11, C12, C16, C17, C4

'LYTHIC
3   10U       CPOL-EUE2.5-7      C7, C13, C3
3   47U       CPOL-EUE2.5-7      C2, C8, C14                                            
8   100k     5% 7.5MM PITCH      R3, R7, R13, R14, R20, R26, R27, R33            
4   100m 35V     CPOL-EUE3.5-8   C18, C23, C9, C15
1   100U 16V     CPOL-EUE2.5-7   C5
                                             
MISC
1   ONE CHEAP MICROPHONE (WHICH WORKS WITH SOUNDBLASTER)
1   10k        TRIMPOT 20T B90P    TB_GAIN                                  
1   LED3MM     LED3MM              LED1                                            
4   JACK 6.3MM PCB                 INL, INR, OUTL, OUTR                            
1   TL074P     QUAD OPAMP          IC2
1   TL071      SINGLE OPAMP        IC1
2   nsl-32sr3  OPTOCOUPLER         OK1, OK2 (HIGH Roff 10-50MS Toff OPTOCOUPLER)                                    
3              MOLEX-02            12V, TB_MIC, TB_ON                              
1              MOLEX-03            +/-15V                                          
1              DC/DC CONVERTER     12->+/-15V like farnell p/n 1671264

 

[plumsolly]

Hi Igor - sorry if the answer to this is obvious. this can run on either 12v or +/-15v right? we don't need both? thanks, Ben

 

[kibadachi]

Hi ,

Where do i connect the TB_ON from the talkback combiner PCB to in the audio box? (the black and brown wire in the photo)

 

[clintrubber]

Thread title adapted to the more common & desirable usage of uppercase & lowercase on these forum pages.

Regards,

  Peter

 

[crisotop]

R16 & 23 are labelled 3k3 on the pcb, but should be 20k according to the schematics and bom, am I correct?

Thanks
Christoph

 

[Igor]

R16 and R23 are 20k, right.

 

[crisotop]

Thanks!

 

[crisotop]

Hi , Where do i connect the TB_ON from the talkback combiner PCB to in the audio box? (the black and brown wire in the photo)

Good question, from looking at the schematic I suspect the two 100R resistors on the audio board - Igor could you confirm this? also are there two spare leads in the control sub-d cable that are reserved for the electret mic in the remote control?

thanks
christoph

 

[Igor]

Christoph, it goes this way:
wnen on terminals tb_on there's 5v, talkback signal is combined with audio.

To connect the tb combiner to CRM, use tb_on terminal on CRM audio pcb. They have same pinout.
100r resistors usen in case something shorted from outside, just to save expensive A6833 relay driver.

 

[Sylvain D.]

Hi Igor,

I can't match up the spacing dimensions for the pins on the 1/4" trs jacks with Neutrik or Switchcraft. Can you please tell me what model connectors you used on the tc?

Thanks

Sylvain

 

[yosh]

This is what I used for the phone jacks:

Neutrik part no. NMJ6HFD2
Mouser part no. 550-20301

Parts fit pcb fine. I haven't tested it yet, but I think the pinout is right.

-Josh

 

[Sylvain D.]

Thanks Yosh!
I'll hunt those down.

S.

 

[plumsolly]

Hello - I'm starting to source parts and I wasn't sure what this meant.

CPOL-EUE2.5-7                                           

Thanks, Ben

 

[rob_gould]

It means polarized capacitor (ie electrolytic) and then I believe the numbers on the end are pitch of the legs and diameter of the body of the component.

Something like this would work I believe :

http://uk.farnell.com/panasonic/eca1vad100x/capacitor-10uf-35v/dp/8766940

 

[plumsolly]

Thanks again Rob! - Best, Ben

 

[plumsolly]

       
4  100m 35V    CPOL-EUE3.5-8  C18, C23, C9, C15

I am still getting together parts, and I noticed C15 and C9 are listed as 100uF on the schematic and layout, but 100mF on the BOM. Also is 100mF (100milifards = 100,000uF)  correct?
Thanks, Ben

 

[Igor]

100uF is correct value.

 

[plumsolly]

Thanks, Igor - So C18 and C23 are 100uf as well?
Thanks again, Ben

 

[Igor]

Use logic

 

[plumsolly]

Use logic

I'm assuming that C18, C23, C9, and C15 are all 100U - But I can't figure out why, if you meant 100U when you wrote 100m, you would list some values as 100m and some as 100U. Or maybe I have it all muddled, but there are discrepancies between the BOM and the schematic that make it even more confusing. I really appreciate the excellent kits and your contribution to the forum, and I am trying not to ask for step by step instructions.
Thanks again and Best, Ben