gated comparator stuck
2004-03-05 by peng3002
The 5th output on my gated comparator is stuck on. Any ideas ?
Thread
gated comparator stuck
Re: gated comparator stuck
2004-03-05 by sasami@hotkey.net.au
>The 5th output on my gated comparator is stuck on. Any ideas ?Check for a wiring error either around the resistor/capacitor coupling
betweent he two halves of the 4051, or look for a short around the buffer
transistor on the fifth stage.
Ken
_______________________________________________________________________
Ken Stone sasami@... or ken@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
Re: gated comparator stuck
2004-03-05 by peng3002
Couldn't find any shorts or wiring errors. Reheated solder joints for
transistor, buffer area. Problem solved. Thanks for you quick
responses, Ken.
transistor, buffer area. Problem solved. Thanks for you quick
responses, Ken.
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, sasami@h... wrote:
> >The 5th output on my gated comparator is stuck on. Any ideas ?
>
> Check for a wiring error either around the resistor/capacitor
coupling
> betweent he two halves of the 4051, or look for a short around the
buffer
> transistor on the fifth stage.
>
> Ken
>
______________________________________________________________________
_
> Ken Stone sasami@h... or ken@c...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies
<http://www.blaze.net.au/~sasami/>
Re: gated comparator stuck
2004-03-06 by peng3002
Spoke too soon. Output 5 still stuck on and it outputs 15V ( the
other outs put out around 11V.
note: worked perfectly when I originally finished the module. The
problem didn't arise until I switched all the 2.2K resistors to 15K
(to make the LEDs dimmer). Do you think it's a bad component
somewhere or are the new resistor values *!@#*!ing it up?
Thanks again,
Peng
other outs put out around 11V.
note: worked perfectly when I originally finished the module. The
problem didn't arise until I switched all the 2.2K resistors to 15K
(to make the LEDs dimmer). Do you think it's a bad component
somewhere or are the new resistor values *!@#*!ing it up?
Thanks again,
Peng
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, "peng3002" <peng3002@y...> wrote:
> Couldn't find any shorts or wiring errors. Reheated solder joints
for
> transistor, buffer area. Problem solved. Thanks for you quick
> responses, Ken.
>
> --- In cgs_synth@yahoogroups.com, sasami@h... wrote:
> > >The 5th output on my gated comparator is stuck on. Any ideas ?
> >
> > Check for a wiring error either around the resistor/capacitor
> coupling
> > betweent he two halves of the 4051, or look for a short around
the
> buffer
> > transistor on the fifth stage.
> >
> > Ken
> >
>
______________________________________________________________________
> _
> > Ken Stone sasami@h... or ken@c...
> > Modular Synth PCBs for sale
<http://www.blaze.net.au/~sasami/synth/>
> > Australian Miniature Horses & Ponies
> <http://www.blaze.net.au/~sasami/>
Re: gated comparator stuck
2004-03-07 by sasami@hotkey.net.au
In order for the output to be around 15V, there MUST be a short circuit. It
may be internal to one or more components, or on the PCB - an etching fault
(like a hair lice copper bridge under the solder mask) or a soldering bridge.
Is the LED lit? It should be introducing a voltage drop if it is. Is the
wire connected to the right spot?
Ken
Ken
may be internal to one or more components, or on the PCB - an etching fault
(like a hair lice copper bridge under the solder mask) or a soldering bridge.
Is the LED lit? It should be introducing a voltage drop if it is. Is the
wire connected to the right spot?
Ken
Ken
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>Spoke too soon. Output 5 still stuck on and it outputs 15V ( the_______________________________________________________________________
>other outs put out around 11V.
>
>note: worked perfectly when I originally finished the module. The
>problem didn't arise until I switched all the 2.2K resistors to 15K
>(to make the LEDs dimmer). Do you think it's a bad component
>somewhere or are the new resistor values *!@#*!ing it up?
>
>Thanks again,
>Peng
Ken Stone sasami@... or ken@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>