This analog ammeter circuit was found in documentation from the 1980s. The components admit equivalents and the scales are determined by the values of the components in the range selection.
This circuit recognizes the tone programmed in an oscillator 555 when inserted into a slot that...
This circuit is based on the Texas Instruments LMC662 and has the function of monitoring the audio...
This circuit for crystals from 100 to 500 kHz was found in an American documentation from 1954. The...