Quick Adder (CB20155E)

This is a factory circuit from an 80's manual. The circuit can be implemented with modern operationals and the power supply must be symmetrical.

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Digital Volume Control with PIC (CB17627E)
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10 W amplifier (CB9905E)
To a 16-0hm load, this amplifier provides a power of 10 W. We found this circuit in a Motorola...
TTL Output Magnetic Reader (CB14249E)
This reader with TTL logic compatible output uses an LM139 comparator. The circuit was found in...