RF 250M or 200M schematic

brandes.cm · 29th January 2010, 07:34 PM

Looking for the 250M or 200M schematic. I was told it was a 301S, I now know it is one of these two. A few sm resistors are missing and would like the values before I continue.

Thanks,
Cory

Perry Babin · 29th January 2010, 07:44 PM

I have 2 schematics that have the file names 200m and 250m but the text has them as H200a1 and H150a1. The PC numbers are 2031 and 2034. The pc number of the 301s is a 4308.

Email me if you want the schematic diagrams.

babin_perry@yahoo.com

brandes.cm · 29th January 2010, 07:56 PM

The board reads PC-4309-H. No camera right now so I can't post a pic. It has a single TL072 opamp stage with 2 rca's feeding it. Both the power and output terminals are offset to one side.

cory

Perry Babin · 29th January 2010, 08:06 PM

Check your email.

brandes.cm · 29th January 2010, 08:11 PM

Thanks, that seems to be it.

The power supply shows 50n06, which essentially is irfz44. My board hads irf3205's. The gate resistors are 33ohms, any thoughts.

Perry Babin · 29th January 2010, 08:20 PM

Any of those will work in this amp. I'd likely use Z44s in it.

brandes.cm · 29th January 2010, 09:24 PM

I dropped in a IXYS 90N055, which is pretty close to the 3205's. The supply fired up and I have 38V rails.

Now I need to replace the missing resistors and RV101. I have a 10K version of RV101, should I then double the two other resistors in the feedback to keep things proportional?

Perry Babin · 29th January 2010, 09:31 PM

You only need to scale the other resistors in the gain circuit if you don't want the gain to be more than it would normally be.

brandes.cm · 30th January 2010, 08:42 PM

What causes C129 to burn up? It's tied to the output terminal. I did read the value of R187 wrong I think. I had 25ohms in there, then read the schematic better and seen it is 2.7ohm. I now have 4/10.7ohms in parallel. Maybe it was messed up from the previous resistor value.

I have a nice waveform until that parts goes.

brandes.cm · 30th January 2010, 10:04 PM

Apparently I caused damage to the cap with my resistor issue. I have since replaced the cap and all is good.

Thanks again for all the help.

29th January 2010, 07:34 PM	#1
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	RF 250M or 200M schematic Looking for the 250M or 200M schematic. I was told it was a 301S, I now know it is one of these two. A few sm resistors are missing and would like the values before I continue. Thanks, Cory

29th January 2010, 07:44 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I have 2 schematics that have the file names 200m and 250m but the text has them as H200a1 and H150a1. The PC numbers are 2031 and 2034. The pc number of the 301s is a 4308. Email me if you want the schematic diagrams. 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

29th January 2010, 08:06 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Check your email. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th January 2010, 08:20 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Any of those will work in this amp. I'd likely use Z44s in it. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th January 2010, 09:31 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You only need to scale the other resistors in the gain circuit if you don't want the gain to be more than it would normally be. __________________ 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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29th January 2010, 07:56 PM	#3
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	The board reads PC-4309-H. No camera right now so I can't post a pic. It has a single TL072 opamp stage with 2 rca's feeding it. Both the power and output terminals are offset to one side. cory

29th January 2010, 08:11 PM	#5
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Thanks, that seems to be it. The power supply shows 50n06, which essentially is irfz44. My board hads irf3205's. The gate resistors are 33ohms, any thoughts.

29th January 2010, 09:24 PM	#7
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	I dropped in a IXYS 90N055, which is pretty close to the 3205's. The supply fired up and I have 38V rails. Now I need to replace the missing resistors and RV101. I have a 10K version of RV101, should I then double the two other resistors in the feedback to keep things proportional?

30th January 2010, 08:42 PM	#9
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	What causes C129 to burn up? It's tied to the output terminal. I did read the value of R187 wrong I think. I had 25ohms in there, then read the schematic better and seen it is 2.7ohm. I now have 4/10.7ohms in parallel. Maybe it was messed up from the previous resistor value. I have a nice waveform until that parts goes.

30th January 2010, 10:04 PM	#10
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Apparently I caused damage to the cap with my resistor issue. I have since replaced the cap and all is good. Thanks again for all the help.

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