In fact, this 1967 Electronic Design circuit generates two symmetrical ramps whose frequency depends on the values of the components used. Modern equivalent transistors can be used.
This low noise audio amplifier stage uses only one transistor and has a high enough gain to...
This circuit is from 1977 documentation, and high current equivalent transistor must be used. The...
This circuit was published in the December 1987 Radio Electronics magazine. It uses two 555s to...