Yahoo Groups archive

Cgs synth

Index last updated: 2026-04-28 23:16 UTC

Thread

Programmer Sequencer Common Pulse Out error.

Programmer Sequencer Common Pulse Out error.

2008-12-31 by sasami@hotkey.net.au

All Type B boards that do not have a revision number have an error.
Physically between the two BC547s on the PCB is a 47k resistor. This should
be 470k, and will solve problems some of you are having with the common
pulse out. Electrically it forms the upper leg of a voltage divider
connected to the emitter of lower transistor in the Common Pulse out circuit.
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Programmer Sequencer Common Pulse Out error.

2008-12-31 by sasami@hotkey.net.au

Argh! Typo. It is the resistor between the two BC557s.

All Type B boards that do not have a revision number have an error.
Physically between the two BC557s on the PCB is a 47k resistor. This should
be 470k, and will solve problems some of you are having with the common
pulse out. Electrically it forms the upper leg of a voltage divider
connected to the emitter of lower transistor in the Common Pulse out circuit.
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Re: Programmer Sequencer Common Pulse Out error.

2008-12-31 by data2action

SHAZAAM!! that was it... switched in the 470k, and now she's
flawless! thanks, Ken!

bbob
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Argh! Typo. It is the resistor between the two BC557s.
>
> All Type B boards that do not have a revision number have an error.
> Physically between the two BC557s on the PCB is a 47k resistor. This
should
> be 470k, and will solve problems some of you are having with the common
> pulse out. Electrically it forms the upper leg of a voltage divider
> connected to the emitter of lower transistor in the Common Pulse out
circuit.
> _______________________________________________________________________
> Ken Stone sasami@... otherunicorn@...
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>

Re: Programmer Sequencer Common Pulse Out error.

2008-12-31 by sasami@hotkey.net.au

Excellent! It was a problem I still hadn't had time to check out. It was
spotted by a gentleman who was studying the circuit diagram and comparing it
to the board. He found several errors. Most were errors on the Schematic,
though that one was obviously on the PCB.
Show quoted textHide quoted text
>SHAZAAM!! that was it... switched in the 470k, and now she's
>flawless! thanks, Ken!
>
>bbob
>
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.