RF 250a2 D6, D9 part #

brandes.cm · 9th June 2010, 03:52 PM

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

Perry Babin · 9th June 2010, 08:30 PM

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?

brandes.cm · 10th June 2010, 02:14 AM

It is switching at 31Khz.

Perry Babin · 10th June 2010, 02:18 AM

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

brandes.cm · 10th June 2010, 02:31 AM

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?

Perry Babin · 10th June 2010, 02:45 AM

I don't see the 60.2 there. Is one of those equivalent?

brandes.cm · 10th June 2010, 02:55 AM

The 250a2 circuit is identical to the 60.2. I need to update that page with all the schematics I have.

Perry Babin · 10th June 2010, 03:06 AM

What are the values of R4, R5, R17 and R18 in the 60?

brandes.cm · 10th June 2010, 03:14 AM

R4 18k
r5 10k
r17 110k
r18 110k

Perry Babin · 10th June 2010, 03:19 AM

Are you sure that R4 isn't a 10k?

9th June 2010, 03:52 PM	#1
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	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

9th June 2010, 08:30 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

10th June 2010, 02:18 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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 __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

10th June 2010, 02:45 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I don't see the 60.2 there. Is one of those equivalent? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

10th June 2010, 03:06 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What are the values of R4, R5, R17 and R18 in the 60? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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10th June 2010, 02:14 AM	#3
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	It is switching at 31Khz.

10th June 2010, 02:31 AM	#5
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	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?

10th June 2010, 02:55 AM	#7
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	The 250a2 circuit is identical to the 60.2. I need to update that page with all the schematics I have.

10th June 2010, 03:14 AM	#9
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	R4 18k r5 10k r17 110k r18 110k

10th June 2010, 03:19 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Are you sure that R4 isn't a 10k? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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