This circuit was found in a 1967 Electronics World. We can design it with a BF245 for the FET and a BC558 for the bipolar transistor. The circuit has 3 scales and a 10 M ohm input resistance.
This circuit is from a technical documentation from the 70s. It makes use of married transistors in a...
This strobe light circuit with incandescent lamp was found in a 1978 publication. We can mount it with...
This circuit produces a square wave signal with the frequency determinated by R1 and C1. The upper limit...