This sensitive 5-band circuit was found in a September 1995 issue of Electronics Now magazine. The headphones, for greater sensitivity, should be high impedance.
This circuit is a documentation of the 70's and therefore valid for analog lines. What the circuit...
The circuit shown fires an auxiliary flash from a flash commanded directly by the camera. The sensor...
This 13.8 V transistorized power supply with a current capacity of 20 A has a protection system...