HVM - huge Volume drop in Vox mode

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Coorec
Learning to Wiggle
Posts: 30
Joined: Thu Apr 30, 2015 10:16 am
Location: Germany

HVM - huge Volume drop in Vox mode

Post by Coorec » Sun Oct 08, 2017 6:41 am

I was finally able to finish my HVM/SE330 unit.

Overall i like what i am getting out of it, but there is one issue i dont know wether its intentional or points towards a mistake i may have made while building it.

When i switch from chorus to vox on the HVM the volume drops by 30 dB.

Complementory to this the Mix Knob needs to be at about 4am to even hear the effected signal.

Any feedback or advice would be much appreciated :)
Last edited by Coorec on Sun Oct 08, 2017 12:08 pm, edited 1 time in total.

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Synthbuilder
Super Deluxe Wiggler
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Joined: Tue Mar 24, 2009 9:12 am
Location: Cumbria, UK

Post by Synthbuilder » Sun Oct 08, 2017 10:16 am

Something is wrong there I think. Try to listen to the raw audio output from the round solder pad of the VOX output header. Compare this to the audio output from the round pad of the CHO header. They should be similar - although the VOX output is very frequency dependant, for example, a very low note will sound quiet when switched to the F4 setting.

If the audio from the two raw outputs is not similar you possibly have a problem with the resistor network RN1. A bad UPR/LWR switch would also cause this problem too.

Tony

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