With the capacitor used, this circuit provides delays of 40 to 60 seconds. Larger capacitors can be used, and the SCR supports an equivalent. The circuit is from the 1977 RC semiconductor manual.
This circuit can serve as the basis for a small FM transmitter with varicap. We found it in a...
This circuit, published in 1978, has an interesting function. In the 2 V test position, the...
This circuit produces paced steps of an engine whose speed can be adjusted in the trimpot. The key on...