This circuit can be adjusted between 0.2 and 2 V to trigger with chosen voltages comparing them with the input voltages. We found it in a 1967 documentation.
In the figure we have a high pass filter configuration with voltage gain equal to 2. This gain is...
This circuit with transistors of the time was found in the November 1972 Radio Electronics...
This TTL circuit uses LED indicators and must be powered by a voltage of 5 V. The capacitor...