Bobo Elektronik
Showing posts with label
3900
.
Show all posts
Showing posts with label
3900
.
Show all posts
Tuesday, May 28, 2013
i have old IC LM 3900 , is that quad OP AMP ?.. okey then i want make it small VU LED meter use only 4 LEDs.
Need scheme ? sorry it's only draft, i edited from LM3915 scheme..
Protoboard
NOT YET BUILD.
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