This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio amateurs of the 90's. The circuit is installed next to the antenna on the mast itself.
Audio frequencies in the 300 Hz to 30 kHz range can be measured with this circuit. Transistors allow...
This circuit was found in an Electronic World of 1968. The circuit uses power transistors of the...
Delayed Pulse Generator This can be considered an "advanced" application where two 555 integrated...