I'm currently trying to repair a primare integrated.
I need 8x BYD17D or substitutes for the power supply section.
These are Controlled avalanche rectifiers.
200v 1.5amp in SOD87 package.
Att is the pdf for said device.
I can only find places that list them as obsolete with no recommended alternatives.
Help, Ta 🙂
I need 8x BYD17D or substitutes for the power supply section.
These are Controlled avalanche rectifiers.
200v 1.5amp in SOD87 package.
Att is the pdf for said device.
I can only find places that list them as obsolete with no recommended alternatives.
Help, Ta 🙂
This is Mouser´s suggestion, and they´re in stock.
https://www.mouser.dk/c/?q=BYD17D&_...QT4T*dW5kZWZpbmVk*_ga_1KQLCYKRX3*dW5kZWZpbmVk
https://www.mouser.dk/c/?q=BYD17D&_...QT4T*dW5kZWZpbmVk*_ga_1KQLCYKRX3*dW5kZWZpbmVk
That's not a controlled avalanche diode. The BYD17D has 7mJ non-repetitive avalanche rating. Is it required to be controlled avalanche? ie is it inductively pulsed into reverse conduction in the application circuit?
Thanks Guys.
I only identified it as an avalanche as that's the info i found.
I did see mousers suggestion, but wasn't sure if the lower 1amp rating would be safe compared to the originals 1.5amp.
Their in the power supply section.
Here's a screenshot with the diodes in red, and a full service manual.
Relevant section of schematic is on page 3.
This amp was brought to me in with an unknown history.
One (half) channel dead, one fuse replaced, two other fuses removed.
I've repaired the damaged half of one channel. (burnt out, shorted, and open parts)
Now I'm chasing very odd voltages left right and all over the place.
I also need to replace the 3w resistors around those diodes purely due to corrosion.
I tried to resolder them but the legs and pads are not healthy and do not want to solder.
All contributing to various voltage losses all over the place.
Gotta love lead free production lines.
EDIT - Doesn't help that primare show the diodes as typo B DY 17d.
I only identified it as an avalanche as that's the info i found.
I did see mousers suggestion, but wasn't sure if the lower 1amp rating would be safe compared to the originals 1.5amp.
Their in the power supply section.
Here's a screenshot with the diodes in red, and a full service manual.
Relevant section of schematic is on page 3.
This amp was brought to me in with an unknown history.
One (half) channel dead, one fuse replaced, two other fuses removed.
I've repaired the damaged half of one channel. (burnt out, shorted, and open parts)
Now I'm chasing very odd voltages left right and all over the place.
I also need to replace the 3w resistors around those diodes purely due to corrosion.
I tried to resolder them but the legs and pads are not healthy and do not want to solder.
All contributing to various voltage losses all over the place.
Gotta love lead free production lines.
EDIT - Doesn't help that primare show the diodes as typo B DY 17d.
Attachments
Used on a freaking voltage doubler that feeds a low current voltage regulator. Pretty much any damn diode will do.
I knew it was doing something odd, well at least to me anyway.
I was thinking it was some strange way to continuously adjust the LM regulators.
But I just couldn't see why anyone would do something so bizzare.
BoydK suggested these ( CD1408-R1200 ) should work fine. Does anyone have any issues with these ?
https://www.mouser.dk/ProductDetail/Bourns/CD1408-R1200?qs=cFTA27Vo%2Bbq806vt/QmiIg==
I was thinking it was some strange way to continuously adjust the LM regulators.
But I just couldn't see why anyone would do something so bizzare.
BoydK suggested these ( CD1408-R1200 ) should work fine. Does anyone have any issues with these ?
https://www.mouser.dk/ProductDetail/Bourns/CD1408-R1200?qs=cFTA27Vo%2Bbq806vt/QmiIg==
The main supply is at 20V, and the low current auxiliary supply (after regulation) is at 26V. How do you get the higher voltage without adding another transformer winding? Voltage doubler. As small as the storage capacitors are for this supply I can’t imagine the current draw to be enough to run a 1A diode outside rating. If things are happening where one would need/want controlled avalanche on these, the main supply is already in a lot of trouble.
Thank you.
I'm a simple man, so it doesn't make sense to me to have transformer secondaries of 40vac,
which then gets dropped,
before being raised,
to feed a regulator,
that drops the voltage again.
Just seems like a whole lot of waste complication and expense.
I mean ok I understand clean regulated power, but there's easier ways to get there.
Anyway, I thank everyone, shall order parts, clean the lead free corrosion, and hopefully be done with this job 🙂
I'm a simple man, so it doesn't make sense to me to have transformer secondaries of 40vac,
which then gets dropped,
before being raised,
to feed a regulator,
that drops the voltage again.
Just seems like a whole lot of waste complication and expense.
I mean ok I understand clean regulated power, but there's easier ways to get there.
Anyway, I thank everyone, shall order parts, clean the lead free corrosion, and hopefully be done with this job 🙂