This circuit converts BCD inputs to analog voltages. The operational amplifier must be powered according to the desired output voltage range. The circuit is from documentation from the 90s.
This 800 Hz sinusoidal oscillator was found in a 1970s American documentation. The transistor...
Similar metronome settings can be found at several points in this section. This was taken from a...
Pressing S1 by a moment L1 glows up, remaining by a time interval depending on C1. This time...