Temperature Sensor (CB6022E)

This circuit was obtained from an 80s factory manual. The integrated circuits used are uncommon today, but the diagram is for reference only.

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Hearing Aid Amplifier (CB19279E)
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Heads or tails CA3130 (CB22009E)
Found in an English publication from 1977, this circuit uses only 1 LED. Unlit means heads and lit...
Solenoid driver (CB9729E)
We found this circuit in an old documentation. The indicated solenoid is of low current type,...