This circuit was found in Texas Instruments documentation from 1968. The transistors are from that time, admitting modern equivalents. The response ranges is from 20 to 20 000 Hz.
The time constant of this circuit is 100 x R1 x C1, which leads to the possibility of obtaining times...
This 3-transistor timer was found in the January 1994 issue of Electronics Now magazine. The...
An way to change the frequency of the previous oscillator (CIR112E) is to add a variable capacitor in the...