nlc1052 serious filter, white nlc version
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nlc1052 serious filter, white nlc version
nonlinear circuits serious filter, pcb+panel, euro
Serious? well... it is based on the Arp4023 and will make the room shake or scream like nails on chalkboard and everything in between. Makes a nice quadrature oscillator too.
more information here: nlc serious filter build guide