This two-year-80s circuit consists of a solution for a small portable recorder powered by cells, as it was used at the time. The circuit can serve as a reference for the recovery of old equipment.
The oscillator shown in the figure generates a 1 kHz tone that is reproduced on the speaker with...
This circuit makes use of a 741 single source operational amplifier to measure resistors on a...
This analog frequency meter for low frequencies was found in Radio Electronics magazine from July...