Disregard my question please... my first email was lost in cyberspace
for three days and I have solved the problem since then, in a much
simpler fashion. No credit to me and all to the person who
suggested that a simple 2n3906 transistor and three resistors would do
the trick -- it does, excellently. And now my x0xb0x (actually
Rui Peixoto's) has an Accent gate CV input. joy!<br>
<br>
Kind regards,<br>
<br>
Amos<br><br><div><span class="gmail_quote">On 11/26/05, <b class="gmail_sendername">Amos</b> <<a href="mailto:controlvoltage@gmail.com">controlvoltage@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Help, O knowledgeable ones!<br>
<br>
I have a very simple question.<br>
<br>
I have done a lot of repair work but very little modification or custom work thus far.<br>
<br>
I am now trying to do a trivial thing and need some help with troubleshooting...<br>
<br>
I want to take a +5V gate signal in and get -5VDC out when it triggers.<br>
So, I figured an inverting unity-gain amplifier would solve my problem.<br>
<br>
I have built the standard textbook inverting amp, using half of an RC4558 opamp IC<br>
it doesn't seem to be inverting... output == input, more or less.<br>
<br>
input and feedback resistor are both 33 ohm<br>
input is to negative (inverting) in, feedback is from output to inverting input.<br>
non-inverting input is grounded. Power is +/- 12V; trigger input is ~5V.<br>
<br>
Is the "textbook" circuit too simple; is there more I should be doing?<br>
What's up?<br>
<br>
Thanks for any help....<br><span class="sg">
<br>
-Amos (accentuating the negative)<br>
<br>
</span></blockquote></div><br>