This signal injector and tracer (follower) was found in an old American documentation. The transistors can be general use and power is made with one or two common cells.
This 4-digit counter uses CMOS integrated circuits and is powered by voltages from 6 to 12 V. The...
This circuit can use almost any operating system and has a high input impedance. The power supply...
This circuit was obtained from a 90s Radio Electronics. The components used are from that time. The...