This circuit was found in ancient American documentation. It makes use of the operational amplifiers of the time, but it can be implemented with modern equivalents.
This circuit can be used to test zener diodes up to 25 V using a standard multimeter. The voltage...
This circuit without any capacitor operates based in the time the transistor need to turn on. The...
This circuit is suitable for recovering vinyl media, having been found in an old sound magazine from...