This circuit was obtained from an Electronics Design of 1964. The circuit makes use of tunnel diodes that are uncommon today. The circuit works with very weak signals.
June 2016 - It can be obtained from the Mouser the MIROE 2253 that converts text into voice.Trata is a...
Instead of the lamps, LEDs can be used in series with 470 ohm resistors. The circuit is from an...
This very low frequency amplifier has a gain of 1,000 and was found in a 1967 documentation. The circuit is...