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#1
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Another diode data sheet challenge
I've got quite a few of these. They look like 1N400x family but are marked W642G1, with 540 on a second line. I've been using them as '4001s but they may well be something else. The W symbol has vertical sides, by the way. It could be a logo. -- Mick (Working in a M$-free zone!) Web: http://www.nascom.info Filtering everything posted from googlegroups to kill spam. |
#2
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Another diode data sheet challenge
"mick" wrote in message eb.com... I've got quite a few of these. They look like 1N400x family but are marked W642G1, with 540 on a second line. I've been using them as '4001s but they may well be something else. The W symbol has vertical sides, by the way. It could be a logo. If you check Vf on a DMM diode check, generally speaking the lower the Vf - the faster the rectifier - then there's the jump to the much lower Vf of SB rectifiers. If you get a Vf measurement actually anywhere near 0.7V, its likely to be a zener. You can check reverse breakdown voltage with a (2 electrolytic) voltage doubling bridge rectifier fed by a high resistance (about 68k for 230V) and monitor the slow voltage rise until it stops, with a DMM. The fully charged electrolytics are of course pretty dangerous - if you just add a shorting switch to discharge the capacitors, it will blow the contacts away - put a NTC surge limiter in series with the switch. |
#3
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Another diode data sheet challenge
On Sun, 21 Aug 2011 16:36:05 +0100, Ian Field wrote:
"mick" wrote in message eb.com... I've got quite a few of these. They look like 1N400x family but are marked W642G1, with 540 on a second line. I've been using them as '4001s but they may well be something else. The W symbol has vertical sides, by the way. It could be a logo. If you check Vf on a DMM diode check, generally speaking the lower the Vf - the faster the rectifier - then there's the jump to the much lower Vf of SB rectifiers. If you get a Vf measurement actually anywhere near 0.7V, its likely to be a zener. You can check reverse breakdown voltage with a (2 electrolytic) voltage doubling bridge rectifier fed by a high resistance (about 68k for 230V) and monitor the slow voltage rise until it stops, with a DMM. The fully charged electrolytics are of course pretty dangerous - if you just add a shorting switch to discharge the capacitors, it will blow the contacts away - put a NTC surge limiter in series with the switch. Thanks Ian. Vf is about 0.525 for these. That's why I was using them as rectifiers. I hadn't thought of doing a reverse breakdown test like that - nice idea. I will now! -- Mick (Working in a M$-free zone!) Web: http://www.nascom.info Filtering everything posted from googlegroups to kill spam. |
#4
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Another diode data sheet challenge
"mick" wrote in message b.com... On Sun, 21 Aug 2011 16:36:05 +0100, Ian Field wrote: "mick" wrote in message eb.com... I've got quite a few of these. They look like 1N400x family but are marked W642G1, with 540 on a second line. I've been using them as '4001s but they may well be something else. The W symbol has vertical sides, by the way. It could be a logo. If you check Vf on a DMM diode check, generally speaking the lower the Vf - the faster the rectifier - then there's the jump to the much lower Vf of SB rectifiers. If you get a Vf measurement actually anywhere near 0.7V, its likely to be a zener. You can check reverse breakdown voltage with a (2 electrolytic) voltage doubling bridge rectifier fed by a high resistance (about 68k for 230V) and monitor the slow voltage rise until it stops, with a DMM. The fully charged electrolytics are of course pretty dangerous - if you just add a shorting switch to discharge the capacitors, it will blow the contacts away - put a NTC surge limiter in series with the switch. Thanks Ian. Vf is about 0.525 for these. Sounds about typical for a normal speed rectifier. |
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