Tape recorder oscillator (CB8289E)

Found in National Semiconductor documentation from the 1980s, this oscillator is used for polarization for cassette tape recording heads.

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Window Comparator with the CA3140 (CB12151E)
This well-known configuration was found in a 1982 publication. Other operational amplifiers can be...
Triac power control (CB6559E)
Suggested by General Electric in 1965 documentation this circuit is intended for the 120 Vac...
Simple ohmmeter (CB23622E)
Combined with the two previous circuits, we can create a simple multimeter with this circuit. The...