This circuit found in 1969 Popular Electronics is used to power a gas laser. The circuit produces a continuous voltage of 1,600 V. Diodes are high voltage types.
This circuit consists of an astable multivibrator whose frequency changes according to the light...
This circuit has a 200 kHz bandwidth and a low input current. The circuit is from the 80's, but...
The sensor can be made using two bare wire or two screen with a piece of tisse between them. One...