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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Sequential unijunction timer (CB10190E)
This circuit with unijunction transistors was found in a documentation from the 80's. The trigger...
Control Matrix (CB11284E)
This circuit allows to activate three functions in a controlled way, determined by a diode array....
AC DC Inverter (CB7835E)
This circuit was found in a 90’s Popular Electronics. The power transistors must be equipped with...