<html><head/><body><html><head><meta name="viewport" content="width=device-width" /><meta http-equiv="Content-Type" content="text/vnd.ui.secure+html;charset=utf-8" /></head><body style="overflow-wrap:break-word; word-break: break-word;"><div class="mail_android_message" style="line-height: 1; padding: 0.5em">You may have already come across this in your VCA research, but Rod Elliot has a good VCA page with all the circuit topologies I've seen: <a href="http://sound.whsites.net/articles/vca-techniques.html">http://sound.whsites.net/articles/vca-techniques.html</a><br>
<br>
And Nikka Bergfors has a VCA comparison page with actual measurements: <a href="http://hem.bredband.net/bersyn/VCA/vca_shootout.htm">http://hem.bredband.net/bersyn/VCA/vca_shootout.htm</a><br>
<br>
Justin<br>
<br>
</div><div class="mail_android_quote" style="line-height: 1; padding: 0.3em">On 03/24/2017, 5:32 PM cheater00 cheater00 <cheater00@gmail.com> wrote:<blockquote class="gmail_quote" style="margin: 0.8ex 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<p>You can put an image up on imgur.</p>
<p>Let's hope your transistor isn't in another (astral) state as well.</p>
<br /><div class="gmail_quote"><div>On Thu, 23 Mar 2017 17:19 Elain Klopke, <<a href="mailto:functionofform@gmail.com" target="_blank">functionofform@gmail.com</a>> wrote:<br /></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex;border-left: 1.0px rgb(204,204,204) solid;padding-left: 1.0ex;"><div class="gmail_msg">can I attach a picture or are attachments taboo in the list?<div class="gmail_msg"><br class="gmail_msg" /></div><div class="gmail_msg">So I really need the buffer? I will have to order some op amps tomorrow then.</div><div class="gmail_msg"><br class="gmail_msg" /></div><div class="gmail_msg">Right at this moment, I have 0V and +5V at my disposal.</div></div><div class="gmail_extra gmail_msg"><br class="gmail_msg" /><div class="gmail_quote gmail_msg">On Thu, Mar 23, 2017 at 10:30 AM, Mattias Rickardsson <span class="gmail_msg"><<a class="gmail_msg" href="mailto:mr@analogue.org" target="_blank">mr@analogue.org</a>></span> wrote:<br class="gmail_msg" /><blockquote class="gmail_quote gmail_msg" style="margin: 0 0 0 0.8ex;border-left: 1.0px rgb(204,204,204) solid;padding-left: 1.0ex;">It would help with a schematic of your actual circuit, since almost<br class="gmail_msg" />
everything seems to differ from the schematic you linked to. :-)<br class="gmail_msg" />
<br class="gmail_msg" />
So, you are connecting the transistor to a small speaker, via the 100k<br class="gmail_msg" />
resistor? Or without it?<br class="gmail_msg" />
I wouldn't expect a sound in either case, due to the tiny tiny signal<br class="gmail_msg" />
(if the 100k is included) or the heavy heavy loading of the transistor<br class="gmail_msg" />
(if it's not).<br class="gmail_msg" />
<br class="gmail_msg" />
Btw, when changing the 2.5 V points into ground, du you have a CV<br class="gmail_msg" />
generator that reaches 2.5 V below ground as it needs to do?<br class="gmail_msg" />
<span class="m_-6269295640439202131HOEnZb gmail_msg"><font class="gmail_msg" color="#888888"><br class="gmail_msg" />
/mr<br class="gmail_msg" />
</font></span><div class="m_-6269295640439202131HOEnZb gmail_msg"><div class="m_-6269295640439202131h5 gmail_msg"><br class="gmail_msg" />
On 23 March 2017 at 16:22, Elain Klopke <<a class="gmail_msg" href="mailto:functionofform@gmail.com" target="_blank">functionofform@gmail.com</a>> wrote:<br class="gmail_msg" />
>><br class="gmail_msg" />
>> What I mean is... how do you connect and measure things?<br class="gmail_msg" />
>><br class="gmail_msg" />
><br class="gmail_msg" />
> I have a tiny speaker. It's worked thus far. My oscilloscope is in another<br class="gmail_msg" />
> state at the moment.<br class="gmail_msg" />
</div></div></blockquote></div><br class="gmail_msg" /></div>
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