INSTRUCTIONS \ TTSH \ VCF

The VCF is a straight forward build. There’s a couple of transistors that should be matched, marked PAIR on the PCB.

 

Parts list for the VCF:

 

Resistors
– 220 x 1
– 470 x 6
– 820 x 1
– 1k x 1
– 1k8 x 1w
– 1k87* x 1 (Tempco)
– 2k2 x 1
– 3k32 x 4
– 10k x 1
– 150k x 2
– 15k x 3
– 23k2 x 1
– 30k1 x 4
– 56k x 1
– 100k x 11
– 196k x 1
– 220k x 1
– 3M3 x 1

 

Capacitors
– 10p x 1
– 50p x 4
– 10n x 4
– 100n x 2
– 10µ x 2 (Electrolytic)

 

Semiconductors and Integrated circuits
– BC558 x 1
– 1n4148 x 4
– 2n3904 x 13
– 2n3906 x 4
– 2n3958 x 1
– 2n5172 x 1
– LM301 x 1

 

Trim potentiometer
– 250 x 1 (500 if you’ve ordered from Mouser)
– 10k x 1
– 100k x 2

 

Populate the module in the same manner as the ones before. Once finished you can test the module by inserting +15V at either of the 2 resistors to the left and a VCO signal to either one of the 5 resistors to the right.

 

vcf

 

In this configuration the filter is wide open and should just pass the signal. So if you input SAW you should see a non-processed SAW at the output. It’s possible to trim the filter after you’ve tested it and confirmed it works accordingly.


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