This circuit was obtained in a 1967 Electronics World. The components are still common today, the SCRs can be replaced by equivalents and the unijunction transistors the 2N2646.
This circuit was obtained in 1981 documentation. It is an FM transmitter that can serve to emit...
This circuit was found in a Radio Electronics magazine from November 1992. The components are from...
This ammeter measures currents in 5 ranges from 50 uA to 0.5 A using a 40 uA instrument, which can be...