This circuit operates with frequencies from 0.5 to 400 MHz. We find it in a 90’s NASA documentation. The transistors are from that time.
This circuit provides a signal of higher frequency the greater the intensity of the light incident on...
This circuit was obtained from a 1978 Practical Wireless. It generates a low frequency, low...
This circuit can be used as a lockable shield. A pulse activates the relay that remains on even...