This telephone amplifier may be used as a free-standing amplifier with speaker, e.g. to listen to a telephone conversation, or the output may be connected to an amplifier or mixing panel (e.g. radio stations).
* input: isolation transformer interface
* speaker output: 0.5W / 8ohm
* line output: 0dB (0.775Vrms)
* power supply: 7 - 9V AC or 9 - 12V DC / 150mA
* PCB dimensions: 2.5" x 2.1"