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Schematics / Sample And Hold

Schematics.SampleAndHold History

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2013-02-24 22:09 [UTC-7] by Blue Hell -
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[[!DIY]] | [[!Sample and Hold]] | [[!René Schmitz]]
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Sample and Hold by René Schmitz ,visit his pages for more details on this module and useful information on synthesizer diy http://www.uni-bonn.de/~uzs159/ from the description given on his site :


There is not much to say to this, a S&H is frequently used to create random voltages, or to sample LFOs resulting in repeating voltage patterns. When constructing this take care to deflux the board. The S&H can handle the "full" +/-10V scale. Operation is very simple, when the Gate of the FET is at -15 the FET is completely off. Thus no current can flow out of the capacitor (exept some leakage). When the Gate is turned towards +15V the FET is turned on and can charge the capacitor to the input voltage. The circuit on the right converts 5V triggers to the +/-15V triggers needed by the S&H
Jörgen Bergfors has pointed out that with a BF245A and the gate resistor R1 is altered to 47k, the circuit can reach -10V input. (Which isn't always the case in the above version.)


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Edit - History - Print - Recent Changes - Search Page last modified on 2013-02-24 22:09 [UTC-7] - 6210 views