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 Forum index » DIY Hardware and Software » YuSynth
Sample&Hold question
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Moevot



Joined: Oct 16, 2019
Posts: 14
Location: Poland

PostPosted: Mon Nov 11, 2019 10:46 am    Post subject: Sample&Hold question Reply with quote  Mark this post and the followings unread

Next module and new problems: D
Noise generator works very well. I have a problem with the second part of the module. The input signal in the first image is sin from LFO, the output has what you see below. The second is Rand from the noise generator. It looks like a lack of sustain, after each sample the signal drops to -7v. I checked everything, changed C4, C5, Q5, U2 and lack of improvement. TL074 heats up a lot. I used BF245B, this is the part list, the diagram is BF245C, maybe there is a reason here. Unfortunately, I have a problem with buying BF245C, I increased C4 to 4.7nF, I tested various C5 capacitors, unfortunately the result is as seen. Help gentlemen.

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Grumble



Joined: Nov 23, 2015
Posts: 1294
Location: Netherlands
Audio files: 30

PostPosted: Mon Nov 11, 2019 3:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

check for a short between pins 13 and 14 of ud2.
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Moevot



Joined: Oct 16, 2019
Posts: 14
Location: Poland

PostPosted: Mon Nov 11, 2019 3:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

The whole was checked, there is no short circuit anywhere
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Moevot



Joined: Oct 16, 2019
Posts: 14
Location: Poland

PostPosted: Tue Nov 12, 2019 11:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have replaced BF245 with MPF102 and everything works perfectly
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