Found in 90s Popular Electronics, this circuit fires an old camera flash of the type with a xenon lamp from the sound captured by a microphone.
This circuit can use common operational amplifiers according to the supply voltage. One suggestion...
This 4.5 MHz amplifier is suitable for analog TV applications. We found it in a 1967 Philips...
The transistor of this circuit can be 2N2222 or BF494. The coil can have 2 to 8 turns of wire 22...