Buchlaish 194 fixed BP filter
this is NOT a VC filter; it has 4 preset bands: LP <200hz, BP 200-900hz, BP 900hz-4khz, and HP > 4khz. 1 in, 4 outs, no vc of the frequency bands or levels. as mentioned, you could run it to 4 VCAs, or to a mixer for a kind of 4band graphic EQ.
PARTS LIST
Resistors
5 x 100k
10 x 10k
6 x 15k
5 x 1k5
4 x 220r
1 x 2k2
2 x 3k3
3 x 4k7
4 x 68k
Caps
2 x 100uf
1 x 10uf
3 x 1uf
3 x 10n
1 x 220n
1 x 22n
3 x 47n
2 x 2n2
1 x 4n7
1 x 910p
Transistors
7 x BC550
4 x BC560
Misc.
1 x .156” power header
1 x ferrite bead
5 x in/out jacks
1 x 100k pot (optional input atten)
PARTS LIST
Resistors
5 x 100k
10 x 10k
6 x 15k
5 x 1k5
4 x 220r
1 x 2k2
2 x 3k3
3 x 4k7
4 x 68k
Caps
2 x 100uf
1 x 10uf
3 x 1uf
3 x 10n
1 x 220n
1 x 22n
3 x 47n
2 x 2n2
1 x 4n7
1 x 910p
Transistors
7 x BC550
4 x BC560
Misc.
1 x .156” power header
1 x ferrite bead
5 x in/out jacks
1 x 100k pot (optional input atten)