The little filter that can ...
Designed by YoMoCircuits in United KingdomThis product is no longer available for sale.
The seller may be offering an improved version or it may be hanging out on the beach, enjoying the retired life.
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This is a shrinkified resonant filter which utilises the classic Sallen-Key topology - the capacitor values in the BOM are such that you'll get a pleasing amount of resonance with the pot turned all …
Read More…This is a shrinkified resonant filter which utilises the classic Sallen-Key topology - the capacitor values in the BOM are such that you'll get a pleasing amount of resonance with the pot turned all the way up. If you want something with a bit more bite then simply use whatever value capacitors you deem appropriate - if you use the values specified in the BOM you'll get a maximum Q of about 25 if memory serves; whilst this won't shred your face off it also means that the thing won't veer off into self-oscillation either.
If you're planning to dip your toe in the water of surface-mount soldering this is an ideal starter board - it has a low part count and doesn't require any special voodoo to get things done; I use SOIC and 0805 components myself and there's nothing remotely scary about SMD soldering if you have a steady hand.
Note, however, that unless you're planning to panel-wire things you'll need an Alpha (or equivalent) dual-gang pot to operate the filter.
A dual power-supply is required too - there's a three-way header for power connectors; the 1U tile spec calls for Futaba J connectors or similar but really you can use whatever you like provided the op-amp has both positive and negative supplies.
It's a pint-sized powerhouse - the board is just over 1 inch square, so it'll fit behind a 6HP width tile. If tiles aren't your thing then it's easy enough to mount two or three of these behind a 'regular' 6HP Eurorack panel to give yourself a nice multiple LP filter.
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