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  1. C

    Two PCBs off of one power source

    Audioguru, This issue was my error. I opened the comm back up, and I had the 10uf capacitor backwards which caused chaos with the batteries. After resolving this issue, the volume pot works, but there does seem to be some damage in the middle of the sweep which was my mistake also. Out of...
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    Two PCBs off of one power source

    Audioguru, I have no idea where the amp is. The schematic I posted is off the FCC web page and is the original submitted drawing for this model radio. They do state that the production models may differ from the submitted drawing to some extent. Bruce
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    Two PCBs off of one power source

    O.K. here is the jack. Right now I have the wire to the amplifier fed off the head of the jack. Perhaps I should have it attached to the shaft? and that is why I don't have volume control? Bruce
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    Two PCBs off of one power source

    O.K. so I was wrong and the headphone output which I am using is amplified. How do I fix my problem do you think? Maybe tonight I will snap an image of the internals of that headphone jack. I noticed when I was breadboarding it, the MC34119 circuit worked with the FRS on either pin of barrel of...
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    Two PCBs off of one power source

    Audioguru, This is the issue I saw coming. Remember one of my initial posts on this subject? I saw a red flag but I thought it was just my musings of a novice. Perhaps I may be right on this one. The FRS volume is, for lack of a better term, "double cut". The original volume pot controls the...
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    Two PCBs off of one power source

    Audioguru, No it's a 10k alright.  I took it apart last night to try both the 3.3k and 10k.  Bruce
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    Two PCBs off of one power source

    The volume/switch pot is round and there is no damage on it.  I have the device wired as you have it already. All to pin 7. Bruce
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    Two PCBs off of one power source

    I changed the resistor from pin 4 to 5 with a 10k instead of the 3.3k because I needed the extra volume.  I tried the with both value resistors tonight, and both are the same - all or nothing.  Bruce
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    Two PCBs off of one power source

    I changed out the main 3.3k resistor at pin 4 to 5 to get a bit more volume on the whole unit per your suggestions prior. Could this be the issue? Bruce   
  10. C

    Two PCBs off of one power source

    Audioguru, Now that am using this amp circuit, I have lost my volume pot on the FRS. I get all, or nothing.  The wipe of the resistance has been cut to immediate if you know what I mean. As I had stated early on, this FRS uses a resistor pot with thumb wheel. Any fixes? I am also wondering how...
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    Two PCBs off of one power source

    Audioguru, I inserted the new amplifier into the communicator tonight. All works great. I tweaked the resistors a bit to mix the volume levels as I wanted and no issues. Thank you for you time and patience on this - and thank you for helping me realize this childhood dream of having an actual...
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    Two PCBs off of one power source

    Audioguru, Something happened last night to the breadboard setup. It worked initially, but as soon as I connected the FRS, and tried to change resistor values out, the thing quit working. I put the multi-tester on the power input wire for the IC chip and it showed good, but putting the probe on...
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    Two PCBs off of one power source

    Audioguru, I'll look through some of the junk in garage for a capacitor that is smaller at 10uf, but will use the one I have if needed. There is not an issue with it working, it's just too big. As for pins 2 and 3, I tried them with capacitors, and with direct connections to gound. Either way...
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    Two PCBs off of one power source

    Audioguru, I don't know how to turn on the "reply with quote" function with this message board. When I stated returning to the 10uf capacitor, I was refering to the fact that I have removed this from your schematic to save space and there was no noticable sound difference. Now that you state...
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    Two PCBs off of one power source

    Audioguru, I shoudl use those small black colored silicone diodes witht he white band from Radioshack? Out of curiosity, which was does the band face in the circuit? And - for the heck of it, what does the supply bypass capacitor look like? Are you talking about returning the 10uf capacitor...
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    Two PCBs off of one power source

    Audioguru, Well my friend, it worked. I am very pleased. After I knew it would work, I started eliminating some of those pieces to see what could be done away with without changing the sound ( I need space). I was able to eliminate the two grounds completely off pins 2 and 3. And - I was able...
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    Two PCBs off of one power source

    Audioguru, After looking at youir schematic again, I kind of figured you would say that. The MC34119 only needs the one wire out of the FRS, where I had both - one to the capacitor and the other to ground. I'll reduce that resister also in my trials tonight. Can 1/4 watt resistors work? I need...
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    Two PCBs off of one power source

    Audioguru, I can't solder wires to parts of the FRS circuit board. That would be very risky, even if I could find those locations you pointed out on it. As for the earbud, I plugged it into the headphone jack, the other end was stripped and I put alligator clips on the ends to the breadboard. ...
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    Two PCBs off of one power source

    Audioguru, Well I breadboarded it tonight. I wired it up to the values as you have it. I tried a few variables with the capacitors - both the 100 and 10 uf. I also used two 1.0 ufs instead of the 1.0 and 5.0 at pin 2 and 3 to ground. I found that the capacitors at these pins either diminished...
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    Two PCBs off of one power source

    Audioguru, Just an observation, but the line off the headphone lead you have me connected to alreay is being fed through a 3.3k and what appears to be a capacitor on the circuit board. I'll have to figure out which solder pont is which on that headphone jack where it is connected to the board...
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