2M voltmeter (CB22051E)

This basic voltmeter circuit has an input resistance of 2 M. The instrument is 100 uA and the transistors can be general purpose JFETs.

Blocking Oscillator (CB17612E)
The transistor can be a BC548 and the coil has the following characteristics for 1 MHz. L1 has 80...
100 W x 60 W Sine Wave Inverter (CB13912E)
This inverter is critical for transformers and can use modern equivalent transistors like MJ2955 on...
Light Relay (CB1304E)
This simple circuit, which requires a low current (50mA) relay for 5 to 12V power supplies, was...