electro-music.com wiki | Schematics / Sample And Hold

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DIY | Sample and Hold | René Schmitz

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.)

< Jen piano 73 | Schematics | Tone generator-tube >
< Noise Gate and Compressor - Sqeeze Box | Listbytype | Sample and Hold using CMOS >