[sdiy] Help trouble shooting mfos echo rockit

[JoeF]

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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