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Uniden PC-76 Hi-Fi mods
- Thread starter 350GA
- Start date
the problem is the lack of schematics to call out part numbers to change. So you'll have to do a side by side comparison against a 29 for the part numbers. Match the 29 location to your 76 and swap.
From GF forum:
Cobra 29LX with the TDA2003 audio chip
Receive:
Change C33 and C40 to 2.2uF non-polarized electrolytic or mylar
Change C48to a 1000uF, 25 volt Electrolytic, observe polarity
Transmit:
Change C69 to a .001uF disc
Change C68 to a 1.5uF Tantalum with the + side towards the right (audio chip) side of the radio.
Change C37 to a .1uF mylar (or parallel a second .033uF mylar with the existing one)
Cobra 29LTD with the TA7222AP audio chip
Receive:
Change C33 and C40 to 2.2uF non-polarized electrolytic or mylar
More highs?: remove C204 (some year ranges don't have this cap)
Transmit:
Change C69 to a .001uF disc
Change C68 to a 1uF Tantalum (some radio's already have a 1uF in them)
Change C37 to a .068uF mylar (or parallel a second .033uF mylar with the existing one)
New 2010/2011 Cobra 29LTD (TDA2003 audio chip)
Receive:
Remove C170
Change C33 and C40 to 2.2uF non-polarized electrolytic or mylar
Transmit:
Change C68 to a 1.5uF tantalum with the + side towards the right (audio chip) side of the radio.
Change C69 and C125 to .001uF disc
Change C37 and C43 to .1uF mylar
From GF forum:
Cobra 29LX with the TDA2003 audio chip
Receive:
Change C33 and C40 to 2.2uF non-polarized electrolytic or mylar
Change C48to a 1000uF, 25 volt Electrolytic, observe polarity
Transmit:
Change C69 to a .001uF disc
Change C68 to a 1.5uF Tantalum with the + side towards the right (audio chip) side of the radio.
Change C37 to a .1uF mylar (or parallel a second .033uF mylar with the existing one)
Cobra 29LTD with the TA7222AP audio chip
Receive:
Change C33 and C40 to 2.2uF non-polarized electrolytic or mylar
More highs?: remove C204 (some year ranges don't have this cap)
Transmit:
Change C69 to a .001uF disc
Change C68 to a 1uF Tantalum (some radio's already have a 1uF in them)
Change C37 to a .068uF mylar (or parallel a second .033uF mylar with the existing one)
New 2010/2011 Cobra 29LTD (TDA2003 audio chip)
Receive:
Remove C170
Change C33 and C40 to 2.2uF non-polarized electrolytic or mylar
Transmit:
Change C68 to a 1.5uF tantalum with the + side towards the right (audio chip) side of the radio.
Change C69 and C125 to .001uF disc
Change C37 and C43 to .1uF mylar
Last edited:
We are in the modifications section of the forum. Sheesh
Thank you 711! I realized that after doing some more research that they are in the same locations as a Cobra 29, just labeled different.
And I personally LOVE the cap mods on the RX side. It makes a big difference in the receive audio quality and helps reduce the white noise hiss. Granted I use different cap values than what Goldfinger recommends to get a particular sound I like, but they work great! Thanks!
And I personally LOVE the cap mods on the RX side. It makes a big difference in the receive audio quality and helps reduce the white noise hiss. Granted I use different cap values than what Goldfinger recommends to get a particular sound I like, but they work great! Thanks!
Welcome , I like the receive after swapping caps. So easily done and makes listening more enjoyable. Glad it worked for you