This very low frequency amplifier has a gain of 1,000 and was found in a 1967 documentation. The circuit is suitable for detecting explosions, distant echoes and seismic vibrations.
This amplifier or stethoscope with headphone output and using a crystal microphone was found in a...
Found in a 90s American documentation, this circuit mimics the Enterprise warning signal from the...
September 2016 - Supercapacitors of 10F to 100F in 3 V from Eaton can now be purchased from Mouser...