This is a 1960s amplifier setup found in a period publication. The circuit uses a special driver transformer that inverts the phases of the signal to excite the output transistors.
This digital clock has a traditional configuration with well-known CMOS integrated circuits. The...
This experimental radio was obtained in an old Argentine publication. Germanium transistors are...
This circuit was found in an EDN from the 90s. The circuit employs a double 555 and uses the...