4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

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Symmetric Tracking Type Power Supply 78xx (CB15160E)
This circuit is from the SGS manual of linear integrated circuits of 1982. The L78xx is equivalent to...
Instrumentation amplifier (CB20685E)
This low displacement circuit was found in American documentation from the 90s. Operational...
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