You need to increase the negative feedback resistor for the TL071. The schematic shows an optional link (or an external level pot) and a 47k resistor. I left the 47k in and replaced the link with a 300k resistor (found by experiment). This gave a reasonable output level in both of my Synthacon filters. I also added attenuators to the audio inputs. If you don't have input attenuators, you might want to try a 500k output level pot in place of the above mentioned 300k fixed resistor. Hope this helps.
Jeff
Jeff
----- Original Message -----
From: peng3002
To: cgs_synth@yahoogroups.com
Sent: Saturday, March 06, 2004 7:27 PM
Subject: [cgs_synth] steiner VCF weak levels
Just finished the Synthacon VCF and it kind-of works. I get very weak
signal at the output (about 1/4 of what it should be)(kinda sounds
like putting a signal through a mixer without the op amp). The
resonance and all the controls seem to function properly. Any ideas
anybody?
scratchin' my head,
Peng
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