Hi all,
Has anyone got a Mark Johnson Quasimodo built up and working that they aren't using and wish to shift? I have a need and would prefer in this instance to not take on yet another project but rather just get the tools to complete a few and (hopefully) clear some desperately needed bench space! However I need this to systematically quieten down some unruly transformer ringing so if someone has a PCB gathering dust I will very happily consider it if nobody is selling a complete unit. Please PM if you can help, I'm in UK for shipping.
Thanks in advance, and kaló Pascha
Has anyone got a Mark Johnson Quasimodo built up and working that they aren't using and wish to shift? I have a need and would prefer in this instance to not take on yet another project but rather just get the tools to complete a few and (hopefully) clear some desperately needed bench space! However I need this to systematically quieten down some unruly transformer ringing so if someone has a PCB gathering dust I will very happily consider it if nobody is selling a complete unit. Please PM if you can help, I'm in UK for shipping.
Thanks in advance, and kaló Pascha
Thanks for the link Ollie [emoji4]
Yes, it appears the same and Mark has referenced them elsewhere and supplied gerbers etc in the public domain, so presume a decent product.
It's my second choice as I'll have to faff around choosing and sourcing component parts which then requires...reading the, the, enoooormous thread...and I just haven't got the time, wanna get a job done and need a tool!
Unlike everyone else my 2P29L stage is proving rather microphonic, and once triggered it seems its the B+ trafo ringing which sustains it. Ferrites on the pins have helped, but I need to get to the bottom of the problem and stopping the ringing is surely a start, quite before the benefits to other components of a quiet PSU on the rack.
Yes, it appears the same and Mark has referenced them elsewhere and supplied gerbers etc in the public domain, so presume a decent product.
It's my second choice as I'll have to faff around choosing and sourcing component parts which then requires...reading the, the, enoooormous thread...and I just haven't got the time, wanna get a job done and need a tool!
Unlike everyone else my 2P29L stage is proving rather microphonic, and once triggered it seems its the B+ trafo ringing which sustains it. Ferrites on the pins have helped, but I need to get to the bottom of the problem and stopping the ringing is surely a start, quite before the benefits to other components of a quiet PSU on the rack.
