This circuit is from an 80's Radio Electronics. The circuit has several output options for 50 mA currents with load indicator through LEDs.
This oscillator controlled based on a CMOS 4011 can produce signals from a few hertz up to more...
This alarm circuit with NC sensors in series was taken from an article in Radio Electronics...
This headphone amplifier was found in a 1966 documentation. The transistor is made of germanium and the...