This circuit was found in a documentation of the 80s, having didactic purpose. For R1 values between 10k to 1M can be used. Transistors are general purpose types.
This circuit uses a general-purpose transistor and has waveform adjustment. We found it in an...
This 1 kW circuit was found in documentation from the 90s. The sensor is a thermistor, and the...
The purpose of this modified astable is to make the initial pulses have the same duration as the...