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4th October 2009, 11:25 PM
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#1 |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Clip LED circuit, will this work ?
Does this cct look any good ?
It uses an LM393 open collector comparator IC. 
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4th October 2009, 11:56 PM
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#2 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Is the speaker signal going in to Negates? Not sure what's going on with that second op-amp, it looks like it will be keeping the LED on all the time?
Those have got to be the most hideous and confusing resistor symbols I have ever seen!
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www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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5th October 2009, 12:01 AM
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#3 | |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Quote:
The second comparator drives an LED. The resistor symbols are quite big to hold value and wattage as well as the reference number.
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5th October 2009, 12:04 AM
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#4 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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So are both op-amp things actually comparators? I think you need to use op-amps otherwise the input to the second "comparator" is just going to be high all the time due to the pull-up resistor.
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5th October 2009, 12:08 AM
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#5 | |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Quote:
The pot is always set to around 5 volts and is adjusted for the LED to come on at the onset of clipping. The first comparator switches low and discharges the capacitor quickly when clipping occurs. The capacitor then charges up slowly once clipping has gone and os keep the LED on for a while.
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5th October 2009, 12:12 AM
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#6 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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OK I was thinking the other way round. It is late
 Seems it should be ok then. Get the breadboard out if unsure 
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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5th October 2009, 12:15 AM
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#7 | |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Quote:
Best to try before going to a proper PCB.
__________________
http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software. |
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5th October 2009, 01:51 AM
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#8 |
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diyAudio Member
Join Date: Oct 2003
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