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Audio Oscillators - CircuitsToday
https://www.circuitstoday.com/audio-oscillators
An introduction to Audio Oscillators also known as RC Oscillators. So far, we have considered the oscillators which use L-C tuned circuit that …
The ‘Audion Piano’ and Audio Oscillator. Lee De Forest ...
https://120years.net/the-audion-pianolee-de-forestusa1915/
In doing so, De Forest inadvertently invented the first true audio oscillator and paved the way for future electronic instruments and music. Lee De Forest’s …
Repairing valve radio sets
https://antiqradio.com/post_repairing-valve-radio-sets.html
If the oscillator signal seems OK then check the mixer‘s grid leak resistor (could be o/c), also check the demodulator / audio amp valve by substitution ---- especially if it’s a UBC41 or EBC41 as these valves suffer from the build up of a conductive …
12 Best Oscillator Circuits Explained
https://makingcircuits.com/blog/best-oscillator-circuits/
Despite the simplicity, the oscillator can produce a good output waveform and will function at radio and audio frequencies. Figure below displays the circuit of a Colpitts AF oscillator. In basis, this is a single-frequency unit (900 …
Valve Circuits 1 - QSL.net
https://www.qsl.net/g3oou/ValveCircuits1.html
With the same valve connected as a triode the small signal conversion gain is x3. No sensitivity measurements were taken but the triode connected circuit should provide a lower equivalent noise resistance. In both mixer examples the local …
Oscillators - How They Work, December 1940/January …
https://www.rfcafe.com/references/radio-news/how-oscillators-work-dec-1940-jan-1941-national-radio-news.htm
Oscillator Output: The output of the oscillator is affected by a change in the oscillator plate voltage for a given turns ratio or coupling between the grid and plate circuits. It is also a fact that an increase in the D.C. plate voltage …
Audiovalve – tube amps since 1982
https://www.audiovalve.info/
It is a dual-mono design, and delivers up to 12 watts per channel of OTL Class A tube power, has multiple inputs (balanced, singe-ended, and even a MM phono preamp built in) has front-panel gain control and a balance control. It also has …
The Valve Wizard
http://www.valvewizard.co.uk/siggen.html
The logical choice for a wide range sine wave oscillator is a Wein bridge, as shown in the image on the right. This works by applying positive feedback around a gain block using a simple RC-CR band-pass filter. The circuit will oscillate at its centre …
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