Build an Audion
#audion
#vacuum tube
#amplifier
#early radio
#signal amplification
#historical circuits
#electronic history
#tube amplifier
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Amplifier Timer Circuit
This circuit turns off an amplifier or any other device when a low-level audio signal fed to its input is absent for at least 15 minutes. By pressing P1, the device is powered on, supplying power to any appliance connected...
Bird Feeder Monitor Circuit
The first amplifier circuit is a bird phone. In this circuit, the electret microphone (MIC1) is mounted in the neck of a large plastic funnel. The amplifier, built around an MC34119, is then placed outside of the funnel with the...
Tube Line Preamplifier Project
The interest in tube circuits remains significant. Therefore, I will provide a comprehensive circuit of a preamplifier that is sufficiently detailed. It is primarily composed of the main preamplifier department, the input selector department, application voltage delay, and the connection...
20W Power Tube Amplifier with EL34
The following diagram represents a 20W power amplifier circuit constructed using the EL34 tube component. The EL34 is a well-known tube that is highly regarded for use in power tube amplifiers. The circuit includes both the tube amplifier schematic and...
The EF50 the tube that helped to win the War
The history of a pioneering tube developed by Philips Research, which, alongside the magnetron, was one of the most significant tubes during World War II. On the evening of May 9, 1940, the radio valve factory of Philips in Eindhoven...
amplifier delay output relay
This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the...
volume loss on tube amplified reel to reel player
A Fujiya FL-555 audio recorder is experiencing issues with low volume output, even when the volume is set to maximum. The device was functioning correctly prior to this problem.
The Fujiya FL-555 is a compact audio recorder designed for high-quality sound...
iPod/MP3 Mini Speaker System
Listen and share music wherever you go with the mini speaker system project. This project allows for music playback in various locations such as dorms, cubicles, or the beach. It serves as an excellent introduction to circuit systems, featuring an...
Amplifier Timer
This circuit deactivates an amplifier or other devices when a low-level audio signal at its input is absent for at least 15 minutes. By pressing P1, the device is activated, supplying power to any appliance connected to SK1. The input...