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.
Found in a 1990s US publication, this alarm circuit detects when a light beam is interrupted. Optical...
This circuit came out at a Wireless World in January 2000. The circuit can be easily assembled as it uses...
This voltage regulator circuit has 1 A of maximum current for a TIP32 and 500 mA for a BD136. The...