bypass caps
I put 0.1uF caps from pin 8 to ground and pin 4 to ground. I did it on the bottom side. Pretty small board. I needed magnification to see what I was doing. You could put 10uF from each supply side to ground at the input. It won't be pretty. But it's a buck. Cannot get much cheaper than that.
I put 0.1uF caps from pin 8 to ground and pin 4 to ground. I did it on the bottom side. Pretty small board. I needed magnification to see what I was doing. You could put 10uF from each supply side to ground at the input. It won't be pretty. But it's a buck. Cannot get much cheaper than that.
corrected schematic
BTW, mine came with different resistors than shown on the ebay site.
r1: 39k
r2 558
r3 1k
r4 3k
r5 68
c2 and c3 are not included and no dedicated solder pads are present.
as delivered, gain of around 4x
BTW, mine came with different resistors than shown on the ebay site.
r1: 39k
r2 558
r3 1k
r4 3k
r5 68
c2 and c3 are not included and no dedicated solder pads are present.
as delivered, gain of around 4x
I got one of theese, if I simply short R5 and R6 it will be unity gain? Im slow 🙂
1Pcs Power Supply 12-35V Ne5532 Preamplifier Preamp Board Dc Single Ic New D | eBay
1Pcs Power Supply 12-35V Ne5532 Preamplifier Preamp Board Dc Single Ic New D | eBay
Trace which pins on the chip they link http://www.remotefactory.com/images/8-pin-dip.png
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Check the pin numbers against this diagram http://circuits.datasheetdir.com/37/FAIRCHILDSEMI-NE5532-pinout.jpg
Have you a multimeter?
Have you a multimeter?
They are the feedback resistors from the outputs to the inverting inputs. If you short them you'll have your unity gain buffers
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the schematic
R4 connects the output to the inverting input. R3 goes from the inverting input to ground. I think you want to remove R3 and short R4. But even if you leave them as is, the gain is very low. The pcb is not really too terrific for rework. Why don't you try it as is?
R4 connects the output to the inverting input. R3 goes from the inverting input to ground. I think you want to remove R3 and short R4. But even if you leave them as is, the gain is very low. The pcb is not really too terrific for rework. Why don't you try it as is?
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