This circuit can keep a set of lamps on for up to 1 minute, time given by C2 and R2 that can be changed. The load depends on the relay. The circuit is old, from 1988 documentation, but totally viable today.
What this circuit does is to agitate a servo at a frequency of 0.25 Hz, which can be used in...
This circuit is suitable for SSB modulation and was obtained from an amateur radio documentation from...
This telegraphy circuit generates an audio tone from a pure RF carrier. We found it in a...