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Old 01-07-2018, 11:01 AM   #1
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Default Scr / thyristers

If the schematic calls for a 200v scr can i replace it with a 400v scr?
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Old 01-07-2018, 11:16 AM   #2
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Default Re: Scr / thyristers

Yes, as long as the other parameters ar also as good or better ie: current
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Old 01-12-2018, 07:31 PM   #3
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Default Re: Scr / thyristers

That particular spec means that the device has to withstand at least 200v. reverse. But there are other important specs with thyristors, especially the turn-on voltage and turn-on pulse width required. Also, you need to look at requirements for the reverse voltage width. If too narrow, the SCR won't turn off. Or, you could just slap in the replacement and look for smoke (just kidding).
Is it plugged in?
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Old 01-20-2018, 04:26 PM   #4
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Default Re: Scr / thyristers

What are you going to use it for resistance load or on a inductive load ?
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Desk Top Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *

These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 01-20-2018 at 04:28 PM..
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