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Post by PinkFloyd on Jun 7, 2012 9:49:19 GMT
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Post by Deleted on Jun 8, 2012 17:34:24 GMT
According to the seller, it requires a power feed of 9-12VAC.
To my mind that makes it a tad awkward to implement, unless you can bypass its own rectifier and feed in whatever it uses.
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Post by Deleted on Jun 8, 2012 17:48:16 GMT
It's the exact same circuit as is used in the Panda. It needs the AC voltage for 'fast-off' to avoid turn-off pop (some amps are troubled by this) If you do not need that option (but do like the turn-on delay and DC protection) it can be used on a DC power supply as well.
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Post by Deleted on Jun 8, 2012 18:01:22 GMT
Aha, OK I understand.
Soooo, lets say you have a spare 15vac secondary. What is the simplest way of regulating that down to the 9-12vac required. (I'm not familiar with the Panda or have its circuit diagram)
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Post by Deleted on Jun 8, 2012 18:17:40 GMT
You can use it on 15V AC as well. Maybe you need to increase the voltage rating of some parts or change a resistor value or even relay voltage. The IC works upto 60V DC.
Should you plan to buy one simply send me detailed pics of top and bottom side and I will draw the schematics and make recommendations. Perhaps there is a schematic with it. You can even change the turn-on time.
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Post by vincef71 on Jun 26, 2012 15:47:20 GMT
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Post by Deleted on Jun 26, 2012 20:26:26 GMT
I will post the schematic AND the improvements shortly. I suggest you fit C4 (22nF) leave R4 open. Fitting a resistor will decrease the sensitivity for DC offset detection so leave that one out. Only if you want it to react faster to DC offset this resistor should be fitted.
I reckon the following caps are used: 470uF > 16V next to the relay (perhaps 100uF or 220uF>16V is used ?) The one next to it = 4.7uF/16V ? The one next to the diode is probably 100uF>16V ? The one next to C4 = 47uF ?
This IC has an AC detect capability which they didn't use. It would have been extremely easy to implement that (just by adding 1 diode) and make the circuit more practical with a fast switch-off action.
It's rather easy to fix though. It requires the cutting of a trace and adding a diode.
It can be used on AC/DC voltages from 9V AC to 30V AC and 12V DC to 40V DC by changing the values of 3 resistors depending on the used voltage.
Maybe I will make a small tutorial even...
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Post by vincef71 on Jun 26, 2012 23:40:14 GMT
I have added the caps value to the picture above.
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Post by Deleted on Jun 27, 2012 7:45:47 GMT
Nice pics b..t.w..... I used one for illustration. original circuit for 9V AC/12 DC supply: As I would implement it and for different voltages as well: modification for fast-off after power-down:
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Post by PinkFloyd on Jun 27, 2012 20:10:55 GMT
Frans.... awesome as always
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