30 MHz Amplifier (CB5939E)

This low noise circuit was obtained from a 1980s US RF publication. Transistors used are uncommon today and the gain is 19 dB..

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Long Interval Timer (CB1521E )
The time constant of this circuit is 100 x R1 x C1, which leads to the possibility of obtaining times...
Amplifier with modulator (CB9176E)
This circuit with a double-gate MOS transistor was found in a Popular Electronics from the 90's....
1 kHz Sinusoidal Generator LM3900 (CB14192E)
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...