Bias oscillator for tape recorders (CB7339E)

This circuit was found in a 1967 Electronics World. The circuit uses components of the time that are difficult to obtain, such as the transformer.

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Amplifier with the TAA370 (CB6277E)
This amplifier for hearing aid was found in a 1968 documentation using an integrated of the time....
9-Band Current Meter with the CA3140 (CB12315E)
We obtained this circuit from a 1993 documentation. The circuit has 9 current ranges that are...
Simplex Optical Data Transmitter (CB15958E)
In the figure we have the transmitter of a data transmission system with optical fiber suggested by...