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 Post subject: Mimosa bias problem
PostPosted: Mon Dec 05, 2022 7:30 pm 
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Joined: Tue Oct 04, 2022 5:51 pm
Posts: 2
Hi all. I recently got the Mimosa and when I first built it I got it dialed in but was having the issue others have posted about where if the blend is cranked no signal passes. I was able to get some replacement transistors. I checked the new ones and they seem good so I swapped both. But now when measuring the bias it reads 0.2 if anything no matter where its turned to. It turns on, passes dry and wet signal, although they have a hum to them. Not sure if this matters but my multimeter has a 40v setting instead of a 20v.

https://imgur.com/a/r61CGbt
https://imgur.com/a/1x0g7NM
https://imgur.com/a/IWSH2Z5


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 Post subject: Re: Mimosa bias problem
PostPosted: Tue Dec 06, 2022 1:30 pm 
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Joined: Sun Jan 22, 2006 1:39 pm
Posts: 5818
Location: Moses Lake, WA
If the blend is 100% wet and no signal passes, then that probably means that there isn't any wet signal at all. And that isn't necessarily a problem with the JFETs. It's usually a problem at the op amp. That isn't to say there is a problem with the op amp itself, so don't replace it yet. Please take voltage measurements of your op amp.

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*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com


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 Post subject: Re: Mimosa bias problem
PostPosted: Thu Dec 15, 2022 4:28 pm 
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Joined: Tue Oct 04, 2022 5:51 pm
Posts: 2
After a decent amount of testing it turns out I had a couple wires broken near their connections. Redid the input, output, and power wiring and it works great now. Problem resolved, chalk it up to being relatively new at this. Thanks for the response though!


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