Sequential Arrow (CB6377E)

We found this circuit in an Electronics World of 1967. The components are of the time and incandescent lamps are used.

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Digitally controlled amplifier and attenuator (CB9030E)
We found this circuit in a 70s American documentation. The integrated circuits are from that time....
1.78 MHz Telephone Transmitter (CB16689E)
This 1992 circuit operates in the range of cordless phones used at the time. The circuit is based...
Dielectric Absorption Meter (CB21586E)
The purpose of this circuit is to measure the absorption current of a capacitor. Dielectric...