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AS3330 VCA
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Electronix



Joined: May 22, 2020
Posts: 3
Location: Belgium
PostPosted: Fri Aug 28, 2020 10:10 am    Post subject: AS3330 VCA Reply with quote  Mark this post and the followings unread
Hi,
I have build a VCA with an AS3330.
The circuit is based on the Digisound 80-9 and Hermflink schematic.
I have a little customized and adapted some components values for a + -12VDC power supply.
I have the result below.
This is with a control voltage of 10V, the output voltage must be normally 0.8x the input voltage.
There is a voltage peak and the rise time is not very good.

Does anyone have an idea what's going on?

Best regards,
Dominique

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blue hell
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PostPosted: Fri Aug 28, 2020 10:50 am    Post subject: Reply with quote  Mark this post and the followings unread
A link to the actual schematic would be helpful.
_________________
Jan
also .. could someone please turn down the thermostat a bit.
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Electronix



Joined: May 22, 2020
Posts: 3
Location: Belgium
PostPosted: Sun Aug 30, 2020 5:06 am    Post subject: Reply with quote  Mark this post and the followings unread
Blue Hell wrote:
A link to the actual schematic would be helpful.

Yes of course. here is the schematic in attachment :

203-006_VCA3330_schematic.pdf
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blue hell
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PostPosted: Sun Aug 30, 2020 5:55 am    Post subject: Reply with quote  Mark this post and the followings unread
Ok, thanks.

When you built it as in the schematic .. the inputs ar AC coupled .. and the output signal as you scoped it is about what is to be expected.
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Jan
also .. could someone please turn down the thermostat a bit.
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Electronix



Joined: May 22, 2020
Posts: 3
Location: Belgium
PostPosted: Tue Sep 01, 2020 9:52 am    Post subject: Reply with quote  Mark this post and the followings unread
Blue Hell wrote:
Ok, thanks.

When you built it as in the schematic .. the inputs ar AC coupled .. and the output signal as you scoped it is about what is to be expected.

Do you mean that the origin of the default is the AC coupling?
This is not the case. The AC coupling can give a signal distorsion at very low frequency but here the frequency is 4 KHZ.
Nevertheless I tried with a bridge on C1: there is no difference.
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