[sdiy] Help trouble shooting mfos echo rockit

[JoeF]

TY to all who helped. I replaced 2 transistors in the filter circuit and that got it going! JoeF.


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On Nov 21, 2022, 10:31 AM, at 10:31 AM, JoeF <frey at radioles.com> wrote:
>Tx loads to all who helped. I have ordered some appropriate replacement
>transistors for Q1 and Q2. Will update when replaced.
>JoeF.
>
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>
>On Nov 21, 2022, 6:47 AM, at 6:47 AM, Tim Stinchcombe
><tim102 at timstinchcombe.co.uk> wrote:
>>Hi Steve, JoeF and any others following,
>>
>>> According to p2 of the schematic, this circuit is operating from a
>>single
>>9V battery,
>>> with a half-rail "ground" generated by a potential divider.
>>
>>Which goes to show that I didn't look hard enough for what 'BP' and
>>'BN'
>>were - the large 'Powering an Echo Rockit from Your Dual Supply' led
>me
>>to:
>>
>>>From the pin 11 reading I am assuming you are trying to run off +9,
>>-9V
>>split
>>> supplies:
>>
>>And as Samuel Jackson once noted in a film:
>>
>>"...everyone knows, when you make an assumption, you make an ass out
>of
>>'you' and 'umption'."
>>
>>So now I am feeling a bit of an ass, and thanks for the correction by
>>Steve!
>>
>>Thus please ignore what I said, and I concur with the inconsistent
>>readings
>>between pins 5 & 7!
>>
>>Tim
>>__________________________________________________________
>>Tim Stinchcombe 
>>
>>Cheltenham, Glos, UK
>>email: tim102 at timstinchcombe.co.uk
>>www.timstinchcombe.co.uk
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