Helmholtz and Koenig’s Oscillator
Helmholtz and Koenig's Oscillator
The tuning fork is one of the first sources producing sound signal of a certain frequency. It enjoyed great popularity in laboratories. Its electric analogue or an audio frequency oscillator was invented by German physicists Hermann Helmholtz and Rudolph Koenig.
Such an oscillator comprised a tuning fork tuned for a certain frequency ...