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Thread: How To: Auxiliary input for the Craig

  1. #21
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    Very cool, thanks for the feedback, I'm definitely no electronics guy or audiophile so I appreciate it. Where did you wind up hooking into the circuitry for the audio input? I considered a connector with a built in switch but I think at the time (this was almost 10 years ago) I wanted to keep my iPod connected all the time and be able to cutover the sound with a simple switch. I think I had plans of placing a small switch on the face plate of the radio for a more polished look but opted not to modify the aesthetics of the unit.

    To be honest I never used this system much, I was never enough of a music buff to bother so I just wind up flipping on the radio

    Todd
    Todd, VIN 1561

    http://1561project.com

  2. #22
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    Best place (IMHO) to do it is at the base of Q131/231... However, too many parts would need to be removed from the board to do it correctly. It is a very dense area of the board to work on too.

    I did mine at R134/234, which worked fine, but as you can hear from the video the volume on the AUX is not as loud as the radio or tape (because I skipped the 1st stage of the amplifier - which you did too). Probably something most people can live with, just got to remember to turn the volume down before pulling the AUX plug if you happen to be blasting it.

    Not sure where others who do this mod "tap in". I'd be interested to know if the tone controls work on radios that have been modified by some of the others who do this.

    I have to admit, I underestimated the total amount of work it was to properly fix/restore the Craig W460. I had changed belts before, and done the flex-circuit on the display before.. This particular unit needed more work.
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  3. #23
    Senior Member Rhye's Avatar
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    Todd's solution worked perfectly well with both of my projects:

    http://dmctalk.org/showthread.php?16338

    http://dmctalk.org/showthread.php?18557

    The only correction I had to make was to the RH channel connection:

    aux_RH_c.jpg

    This is because the pots are axisymmetrical, not plane-symmetrical. All of the functions (vol/bass/treble/loudness/balance) work just fine.
    Last edited by Rhye; 12-19-2020 at 08:29 AM.

  4. #24
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    So, the schematics are wrong??

    The tone controls are clearly upstream of the volume control.

    There is a pre-amp (Q131/231), then the tone controls (IC331) then the loudness (Q133/233), then the volume/balance, then the final power amp (IC151/251), then the fader.

    Possible you tapped in to the tone control in the stack of pots, and not the volume control? The tone controls are fed from R134/234, so it would probably work (I guess it did).. But, there are some other components at that node. Which side of R136/236 you are on would change the behavior a bit, but would still work. Either way, this is not "at the volume control" as previously indicated.

    Fader control is at the output of the final amplifier, so it will always work.
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  5. #25
    Senior Member Rhye's Avatar
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    Quote Originally Posted by Malevy View Post
    Possible you tapped in to the tone control in the stack of pots, and not the volume control?
    That's right - the connection points on Todd's pictures are not the volume but bass/treble pots. Here's exactly where it hooks up:

    aux_in.jpg

    Sound level seems just fine to me, despite bypassing the first two transistor stages. I guess it's the IC331 that does all the preamp job here.

  6. #26
    Senior Member Rhye's Avatar
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    Quote Originally Posted by Rhye View Post
    Sound level seems just fine to me, despite bypassing the first two transistor stages.
    OK, one stage actually 'cause the second one is obviously a muting function. Anyway, I once tried to inject the signal to the base of Q131/231 but with no success (AFAIR, the aux sound level was very low) - so I just went Todd's way.

  7. #27
    Senior Member DMC-81's Avatar
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    I hooked my AUX following Todd's directions and they worked fine for me as well.

    Also, if the tone controls are upstream of the volume controls, doesn't that mean that you can adjust them before the sound signal is sent to out the AUX wire.. or am I missing something?
    Dana

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  8. #28
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    Quote Originally Posted by Rhye View Post
    That's right - the connection points on Todd's pictures are not the volume but bass/treble pots. Here's exactly where it hooks up:
    As I said previously, that explains why I thought there would be a problem. Instructions say "volume control", but it is actually the tone control- which should work fine.
    __________________________________________________ ____________________
    Got any new Purflux oil filters? I may want to buy them.
    Learn about Vin 01860 with a Legend Industries engine: https://malevy-dmc.blogspot.com/2022...oDeLorean.html
    I can fix your Craig W460 radio: https://malevy-dmc.blogspot.com/2022...te-player.html

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