<html><head></head><body style="zoom: 0%;"><div dir="auto">Tx loads to all who helped. I have ordered some appropriate replacement transistors for Q1 and Q2. Will update when replaced.<br></div>
<div dir="auto"> JoeF.<br><br></div>
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<div class="gmail_quote" >On Nov 21, 2022, at 6:47 AM, Tim Stinchcombe <<a href="mailto:tim102@timstinchcombe.co.uk" target="_blank">tim102@timstinchcombe.co.uk</a>> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="blue">Hi Steve, JoeF and any others following,<br><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> According to p2 of the schematic, this circuit is operating from a single<br></blockquote>9V battery,<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> with a half-rail "ground" generated by a potential divider.<br></blockquote><br>Which goes to show that I didn't look hard enough for what 'BP' and 'BN'<br>were - the large 'Powering an Echo Rockit from Your Dual Supply' led me to:<br><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;">From the pin 11 reading I am assuming you are trying to run off +9, -9V<br></blockquote>split<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> supplies:<br></blockquote><br>And as Samuel Jackson once noted in a film:<br><br>"...everyone knows, when you make an assumption, you make an ass out of<br>'you' and 'umption'."<br><br>So now I am feeling a bit of an ass, and thanks for the correction by Steve!<br><br>Thus please ignore what I said, and I concur with the inconsistent readings<br>between pins 5 & 7!<br><br>Tim<br><hr><br>Tim Stinchcombe <br><br>Cheltenham, Glos, UK<br>email: tim102@timstinchcombe.co.uk<br><a href="http://www.timstinchcombe.co.uk">www.timstinchcombe.co.uk</a><br><br><br><br><br><br></pre></blockquote></div></body></html>