Cobra 29 LTD Audio Chips

There are three different audio chip versions for the Cobra 29 LTD series. The first audio chip used for many years is the popular TA 72222 AP a 10 pin frequency compensated audio chip.The complete pin-out for the TA72222AP is provided below. The output power is rated at 5.8 watts.

Pin-Out for TA72222AP. The cross reference is NTE1278

1) The supply voltage 13.8 v

2) Ripple filter voltage 2.95 v

3) No Connection voltage 0 v

4) Input voltage 0 v

5) Feedback loop voltage 1.84 v

6) Gain adjust voltage 1.85 v

7) Ground chassis

8) Ground chassis

9) Output voltage 6.8 v

10) Bootstrap voltage 13.1 v

The second version has a different pin-out and can not be used as a direct replacement. At this time I do not know what the complete pin-out is, but the output is pin 10. It is a 10 pin frequency compensated audio chip. The number on the chip is YD 1022.

The third version is the popular TDA 2003. This is a 5 pin audio chip. I have never seen this chip used in a CB radio until recently. The pin-out consists of an inverted input, a non-inverted input, an output, a supply (13.8 volts) and a ground pin. There is no frequency compensation circuit, and I have found that the toys and modifications that work well in the first two 10 pin audio chips may create problems in radios with the TDA 2003.; especially RF (radio frequencies).

More information will be added.

12-14-09

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