This circuit is suitable for calibrating old oscilloscopes. It was found in a 1980s documentation. It generates precise signals given by the crystal.
We found this project in a 1982 publication. What we have here is an audio signal relay trigger, which...
We found this circuit in an old French documentation from the 70s, but it can be assembled using...
We found this circuit in an application note from Linear Technology of the 90s. The circuit uses...