Question about Cobra 25 LTD 40-Channels Base CB Radio

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Af audio power amp

In the old cobra ltd`s they used TA7222AP with pins 7 n 8 soldered together, I have a new version of this radio and has a output with YD1022 stamped on it, with pins 9 n 10 soldered together, pins 7 n 8 soldered together , pins 5 n 6 soldered together, ? is this output YD1022, the same as a TA7222AP,

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On the YD1022 the pinout is: Corresponding pins on the TA7222 :

1,5 & 6 are ground 3, 7 & 8
2 is audio input 4
3 is feedback 6
4 grounds through a capacitor for frequency compensation 5
7 & 8 are audio output 9
9 & 10 are +12VDC VCC 1

The TA7222 also uses pin 10 for feedback & freq. comp. The circuits are very different & would need to be redesigned to interchange these chips.

Posted on Sep 26, 2008


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Initially, pls confirm that there is modulation (transmit audio). The reason I asked is if IC4 (TA7222P) is blown, then the radio would have no audio amplifier which would explain no receive audio. Additionally, the final and pre-final (TR15 & 15) gets is modulated TX+12 through D8 from T1 which in turn is the output of IC4 through C48.

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