We found this circuit in the June 1987 issue of Radio Electronics magazine. With it, it is possible to receive signals from the bands determined by the crystals in a common medium wave receiver.
This circuit from March 1984 Radio Electronics is intended to allow the use of an oscilloscope to measure...
The circuit in the figure uses the four current amplifiers of the LM3900 to generate a sawtooth signal...
This amplifier was found in a technical documentation from the 1970s. The circuit uses 2N2218...