Oscillator HA7210 (CB22402E)

This circuit is from an old documentation and can be used to generate signals in different frequency bands.

FET Voltmeter (CB10308E)
This circuit was obtained in an English magazine of 1976 and can be assembled with equivalent...
9 V x 40 mA power supply (CB12849E)
This power source was found in an old Argentine publication from 1973. The transistor could be the...
Voltmeter with FET (CB1541E )
This circuit can measure voltages from 0 to 10 V with a very high input resistance. The circuit is...