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Old 9th June 2010, 03:52 PM   #1
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Default RF 250a2 D6, D9 part #

Does anyone have the part # for those parts, the schematic doesn't list it. The 60.2 schematic which is identical lists that zener a 1n5366, which is 39Volts.
The reason I asked the above question....

I had this 250a2 donor board laying around and this 60.2 that I just picked up for $7. It had blown supply fets, replaced those and all is well. I happen to compare the 250a2 pcb with the 60.2 and noticed components and values are identical. So basically I updated the 60.2 with the mesha strips from the 250 and thought why not transplant the xfrmer as well. This worked, but the output remains the same as with the original xfrmer. Maybe the xfrmers are identical as well, but I don't think so, my previous measurements from other 250's I would get 22Vrms across a 3 ohm load. The 60.2 I get 18Vrms across 3 ohms.

Curious if I could get 250 like power from the 60.2, honestly the specs are not to far off. Must be another difference that I haven't noticed.

Cory
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Old 9th June 2010, 08:30 PM   #2
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The SMD zener and the 5366 have nothing to do with the regulation. The 5366 clamps any inductance leakage spikes that may occur. The SMD zener works to do the same thing but they use the FETs to do the clamping.

What is the duty cycle of the square wave on pins 9 and 10 of the TLx94 IC?
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Old 10th June 2010, 02:14 AM   #3
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It is switching at 31Khz.
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Old 10th June 2010, 02:18 AM   #4
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The duty cycle is the percent of the time that the drive voltage on pin 9/10 is high for each cycle. If you have a scope, you can calculate it.

If the duty cycle is very low with no load, the voltage is being regulated and you'll need to change the value of the resistors responsible for regulation. If you have the schematic diagram, send me a copy and I'll tell you what needs to be replaced.

babin_perry@yahoo.com
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Old 10th June 2010, 02:31 AM   #5
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Sorry, I know what duty cycle is, just spaced out there. The duty cycle is 1%, the positive pulse is ~480nS.

I don't have the electronic copy at home, you can grab the pdf from my site:
https://sites.google.com/site/brandescm/home/projects

Are you talking about secondary side regulation?
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Old 10th June 2010, 02:45 AM   #6
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I don't see the 60.2 there. Is one of those equivalent?
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Old 10th June 2010, 02:55 AM   #7
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The 250a2 circuit is identical to the 60.2. I need to update that page with all the schematics I have.
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Old 10th June 2010, 03:06 AM   #8
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What are the values of R4, R5, R17 and R18 in the 60?
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Old 10th June 2010, 03:14 AM   #9
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R4 18k
r5 10k
r17 110k
r18 110k
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Old 10th June 2010, 03:19 AM   #10
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Are you sure that R4 isn't a 10k?
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