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Old 19th April 2009, 06:22 AM   #101
Salas is offline Salas  Greece
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Quote:
Originally posted by hihopes
I have downloaded the datasheet for irf9610 from International Rectifier, but it doesn't show the pinout - just says it is a TO220AB package. As far as I can find out, this seems to have a pinout of G,D,S (looking from the front). Can anyone confirm this? I am drawing up a PCB and obviously need to get this right. I can post a jpg of the PCB if anyone is interested, or would like to give feedback on it.
This is from a Samsung Electronics datasheet.
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Old 19th April 2009, 08:55 AM   #102
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Default PCB

Quote:
I am drawing up a PCB
Hello Hihopes,
Are you planning the PCB for two IRF9610 or for the, at least simmed better, one IRF9610 and BJT(MJ350) for the lower device?
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Old 19th April 2009, 08:28 PM   #103
hihopes is offline hihopes  South Africa
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Thanks - G,D,S it is.

The first PCB will be for the 2 mosfets. My past experience tells me that mosfets tend to be quieter, or at least more benign-sounding than BJT's. (J-fets are my real preference - after valves of course)

This will not be an Eagle or other commercial effort. I am doing it in Coreldraw. I print it out on label paper, stick the paper on to the top side of the pcb sheet and use it for a drilling guide. Then I connect the drilled holes as required with a black felt-tip marker and etch the board. Primitive perhaps, but cheap and effective. (I have built up a library of parts at exact scale in Coreldraw over the last few months.)
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Old 23rd April 2009, 08:40 PM   #104
hihopes is offline hihopes  South Africa
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I will try to attach the PCB drawings.
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Old 23rd April 2009, 08:46 PM   #105
hihopes is offline hihopes  South Africa
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If you print them out at the measurements shown next to the boards, they will be exactly to scale. All resistors are 1/4 w except those shown as 2w. There is an optional larger resistor instead of the parallel 2w's. It is shown in blue, but please note that since I did not have one to measure, I took a bit of a guess at the size of it.
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Old 24th April 2009, 06:17 AM   #106
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Why MOSFETs? The obvious solution should be to go for a PJF or MOSFET at the top followed by a PNP.

Even if MOS are easier to handle they are not the obvious choice due to their extreme capacitances. This also shows as they give a more restricted bandwith than with BJT.
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Old 24th April 2009, 11:31 AM   #107
Salas is offline Salas  Greece
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I would listen to both. Its easy.
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Old 24th April 2009, 07:14 PM   #108
Salas is offline Salas  Greece
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Quote:
Originally posted by hihopes
If you print them out at the measurements shown next to the boards, they will be exactly to scale. All resistors are 1/4 w except those shown as 2w. There is an optional larger resistor instead of the parallel 2w's. It is shown in blue, but please note that since I did not have one to measure, I took a bit of a guess at the size of it.
Did you think of space for sinking the lower part? There are voltage and current situations that it will need sinking.
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Old 24th April 2009, 07:20 PM   #109
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Quote:
Originally posted by hihopes
I will try to attach the PCB drawings.
You forgot to put a capacitor on the PCB.
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Old 25th April 2009, 08:11 AM   #110
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In the first place, why make PCBs for a prototype? Even if it, as in this case, seems very promising. As Salas indicates listenning test should be done.

I am eager to try the "CVS" as driver load in a DC coupled SE with trioded E280F and 6B4G.

In this case the "CVS" could be used to fine tune bias for the output tube.

Will be back with a full schematic.
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