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Old 30th May 2010, 10:43 PM   #1101
piero7 is offline piero7  Italy
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Hi salas,

I'm gonna order the transistors for this project on the quaghao board, but RS has not the 2SK170, may I use the 2SK117? I need about 300V and 50mA and the VCC in is about over 400V, what the right value for R1 and R3? Do you suggest to use D1 over the mosfet?
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Old 30th May 2010, 11:15 PM   #1102
Salas is offline Salas  Greece
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2SK117 is alright substitute. Don't drop 100V across the reg, its wasted heat and bigger sinks. Drop it in RC steps before, so you pre-filter also. Even 20V in-out will be more than good. Don't know about D1 in Quanghao's, had some problems he wrote, was blowing the 9610, but that was with his first try, had significant layout distance. Keep a spare 9610 and try underneath it directly with D1. Its good for general safety to be there if it does not blow anything. If it does, replace 9610, take D1 out and forget about it. In my P2P it did not blow something. OTOH a DIYer told me the reg even survived some output short without any guard Zeners at all, but sounds like pulling a wheelie without a helmet.
I would start 33R R1. But would check it passes 70mA. LEDS & VGS vary. 68K R3 5W good for circa 350V in.
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Old 31st May 2010, 04:27 PM   #1103
piero7 is offline piero7  Italy
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Argh! Farnell hasn't 2SK117 and 2Sk170, and RS the first will be available at the end of this month

Salas, any other equivalent transistor available on rs or farnell?
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Old 31st May 2010, 04:30 PM   #1104
Salas is offline Salas  Greece
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Ebay has many 117.
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Old 31st May 2010, 06:26 PM   #1105
piero7 is offline piero7  Italy
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thanks salas!

About D5-D6-D7-D8, Quan state 1n41742A on the pdf, and on the board is stamped 1N4142 what is the zener to use?
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Old 31st May 2010, 06:41 PM   #1106
Salas is offline Salas  Greece
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Any 12V 0.5-1W Zeners.
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Old 1st June 2010, 02:06 AM   #1107
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Quote:
Originally Posted by piero7 View Post
Argh! Farnell hasn't 2SK117 and 2Sk170, and RS the first will be available at the end of this month

Salas, any other equivalent transistor available on rs or farnell?
Like 2sk170.

zenner diode protect 9160 and 840 you can use 6V to 12V /1/2W
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Old 24th June 2010, 10:58 PM   #1108
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How can I measure/test if the led's I got are the right ones for the job?
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Old 24th June 2010, 11:22 PM   #1109
Salas is offline Salas  Greece
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With a 9V battery and 680R resistor, string 3 LEDs and measure the voltage drop across them 3. Choose a trio that drops 5.4-5.7V.
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Old 25th June 2010, 08:32 AM   #1110
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Thanks Salas.
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