Vibrato circuit

Posted on Feb 5, 2014

RF Cafe visitor Jim L. requested that I post this Build Your Own Vibrato article from the December 1957 edition of Popular Electronics. `Make like Elvis with an `electronic` throbbing guitar, ` is the pitch line. Vibrato, for the non-musically inclined, is the `wa-wa` sound of an instrument as it smoothly wavers in pitch about a central note.

Vibrato circuit
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This circuit is for use with an electric guitar, but acoustical stringed instruments like the violin and cello are routinely played with vibrato effect by rocking the finger up and down the length of the string. In typical 1950s style, the project is built with point-to-point wiring rather than using a printed circuit board. If you own an electronic musical instrument or a conventional instrument equipped with a pickup, chances are that the vibrato described in this article is just what you`ve always wanted. A vibrato is a device which continuously and automatically varies the amplitude of the music at a low rate of speed, usually somewhere in the range of 6 to 15 times per second. For instance, it is a vibrato which produces the soul-stirring throbbing, especially in the bass notes, of a pipe organ. Construction. Layout and wiring are not especially critical. For convenience a turret socket was used to mount the oscillator tube, V1, and its components, but a standard socket and tie points will do as well. Miniature coaxial jacks, of the type found on most hi-fi amplifiers, were used at J1 and J2 for the output and input connections, respectively. If your setup requires something different, any conventional type of jack may be employed. Keep the power supply components well separated from the oscillator and modulator components, to prevent hum pickup - and orient the tube sockets for reasonably short lead connections. Make...

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