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Speaker Turn On Delay and DC Protector Board Set (V2)
Speaker Turn On Delay and DC Protector Board Set (V2)
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Old 1st April 2013, 11:33 PM   #81
nigelwright7557 is offline nigelwright7557  United Kingdom
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Location: Carlisle, England
A simple protection pcb can be made using a PIC to detect DC and control a relay.
On power up the PIC holds off the relay for 4 seconds.
If the PIC detects DC for more than 500ms it shuts down the relay.
You don't even need an A2D converter as the PIC's input pin threshold is 2 volts.
Just scale two resistors to get the positive phase on one pin and another two resistors to scale the volte on another pin.

I keep seeing large protection pcbs with loads of transistors and op amps when a simple PIC will do the job easily and intelligently.
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Old 5th April 2013, 03:28 PM   #82
DrTupfer is offline DrTupfer
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Hello,

I use the Original-PCB. But I have a problem. I don't understand, how does the
DC-Detection work, if the circuit no connect with the Amp-GND (see the
Fig. board Wiring Guide)?

After my construction the testing und calibration was ok.

thank you for your help

Lutz
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Old 5th April 2013, 08:08 PM   #83
McQuaide is offline McQuaide  United States
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Jojo, are there some voltages I could check while the unit is in operation? I can't find anything wrong with the way it was built.
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Old 5th April 2013, 08:59 PM   #84
Art M is offline Art M  United States
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Default Dangerous circuit

Why is this circuit and discussion not prohibited ?

" Certain inherently dangerous topics are not allowed. At this time they include but are not limited to: discussing power supplies directly fed by mains current without a transformer "

This circuit clearly has a line connected power supply with no transformer: Rectifier, filter and voltage regulator for deriving 24VDC.

If allowed, I am seeking more latitude in discussing line connected power supplies
such as Switching power supplies.
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Old 5th April 2013, 09:23 PM   #85
McQuaide is offline McQuaide  United States
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It's powered by an 18v toroidal transformer. Not sure what you're referring to...
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Old 6th April 2013, 07:20 AM   #86
Art M is offline Art M  United States
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I was referencing the " Power supply soft start board" which is mentioned/ discussed in this thread, sold by DIY Audio store.
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Old 6th April 2013, 08:59 AM   #87
AndrewT is offline AndrewT  Scotland
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It is allowed because it is stocked by DIYaudio.

Otherwise the Moderators would close it down.
It is clearly in contravention of The Forum Rules.
And yet the Moderators ......
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Old 22nd April 2013, 02:30 AM   #88
organics1 is offline organics1  Germany
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Location: Giessen, Germany
Talking Board Finished and ROCKIN' DA HOUSE!

'Twas a very fruitful day!
Finished my first ever amp project, which is Mr. Elliott's P101. Wiring up the diyAUDIO Speaker Protector board was really easy. As I posted on the other forum about the Soft Start board, "It was a piece of cake," even though I've never done anything like this before. All day long I've been thumpin', bumpin', groovin', and grindin'!
Since I'd purchased a Plitron transformer with FOUR secondaries I didn't need another small transformer. Besides the two main secondaries (at 42-volts each) there is one at just under 9 volts and another at 13-volts. I'm using series resistors to step down current a bit on the 13-volts, but one of my electronic genius friends suggests I use a 3-terminal voltage regulator IC. Since he's a veteran engineer with patents I guess I had oughta do what he says.

Thanks to diyAudio boss man, Jason Donald, for his encouraging emails while I was doing this. Look forward to doing business with you again soon.
http://imageshack.us/a/img405/2554/d...otectfinis.jpg
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Old 22nd April 2013, 02:00 PM   #89
nrg2009 is offline nrg2009  United States
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Organics1 - I have 2 questions:

Would you mind posting your BOM on this thread? I could not find the NPN transistors specified, and I don't want to make assumptions on parts substitutions.
How would you test if the speaker protection is actually working?
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Old 22nd April 2013, 05:02 PM   #90
Rixsta is offline Rixsta  United Kingdom
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Location: Barrow-In-Furness, Cumbria
Speaker Turn On Delay and DC Protector Board Set (V2)
Hey!

Ok just wondering, would building one of thise protection units be ok for the F5Turbo amplifier ? Iv'e seen on ebay some good protection kits but from what i heard many wont protect over 35watts or so. even tho they may be rated at 30amps. hmm
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