# Problems with the stripboard Lp vcf layout **URL:** \ **Category:** DIY STUFF\ **Created:** [April 2, 2020, 7:54pm UTC](https://lookmumnocomputer.discourse.group/t/problems-with-the-stripboard-lp-vcf-layout/510 "2020-04-02T19:54:43Z")\ **Posts on this page:** 1\ **Showing post:** 23
**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\ **Post date:** [June 1, 2020, 1:15pm UTC](https://lookmumnocomputer.discourse.group/t/problems-with-the-stripboard-lp-vcf-layout/510/23 "2020-06-01T13:15:34Z")
Odds are you’re overloading the TL07x opamps (they don’t like it when the input goes too low), and need to attenuate. Lots of references to that in this thread: > [@LMNC MS20 Filter Low Output](https://lookmumnocomputer.discourse.group/t/lmnc-ms20-filter-low-output/660): > > Hi all, I just built the LMNC MS20 stripboard filter last night. The output is VERY low, like almost inaudible…I can hear the cutoff and resonance working and the LEDs are lighting. What is the normal operation of the LEDs? BOTH of mine are lighting up when there seems to be a heavy load. Are these supposed to operate independently? Someone also mentioned on a different thread to try passing audio through the filter without any power. I tried that and did not get any sound out of the filter. A… Consensus seems to be that changing the input resistors to around 20k is about right for most users (the performance filter’s 100k is too high, the stripboard layout’s 10k is too low). --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/problems-with-the-stripboard-lp-vcf-layout/510)._