The 555 electronic ventriloquism circuit

Published:2011/5/27 2:49:00 Author:nelly | Keyword: electron, ventriloquism, sound circuit | From:SeekIC

As shown on the figure 11-18, this circuit consists of three 555 circuits and a field effect transistor. IC1, IC2 and IC3 all work in the state that is unsteady and multi-vibration, the difference is that IC2's discharge end 7 foot contacts the field effect transistor VT1's source. When the C7's voltage on the IC3 oscillation circuit changes, the VT1's grid voltage also changes. This electrical resistance D-S changes with the voltage G-S, which leads IC2 to produce the variable oscillation frequency, the frequency is between 1Hz and 300Hz. It can simulate many kinds of sounds through the integrated test among the potential including RP1, RP2, RP3, RP4.



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