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Old 30th January 2005, 08:04 PM   #11
TO-3 is offline TO-3  Peru
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The MosFets are TO-220 devices that are mounted on the heatsink. They are called 'switchers' because all they do is turn on and off. Pin 1 is usually the gate and pin 2 is the drain and pin 3 is the source. I stated, up above, the easiest way to test these devices. The SG3525A, is a common PWM chip that is used in many switching power supplies, here is a link: http://rocky.digikey.com/WebLib/On-S.../SG3525A-D.pdf

My computer is being a piece of chit right now and won't let me operated my scanner. I need to reformat my drive and reinstall everything, then I should be able to scan some schematics that will help you visualize what's going on in the switching power suppies.
I'll post more after I fix by f'ing computer.
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Old 31st January 2005, 06:55 AM   #12
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Here is a schematic showing a simple switching power supply. Q1,2 are the switchers in the schematic. Notice that the output pins of U3(pins 11 & 14) are conneted to the gate of the mosfets through R4 and R6. Also, notice that B+ is connected directly to the transfomer, and is grounded through the switchers.
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Old 1st February 2005, 12:27 AM   #13
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Default TO-3...if you may be so kind...

When did you work for PPI and what did you do for them? I know the old Art series quite well - especially the overabundance of silicone thermal goop they used at the time.

Do you have the schematics to the A600 Amp? I've got one that has quite a few eroded traces from a little marine trip its former owner went on. I'd like to know where they go. Please let me know at:

envisionelec(at)earthlink(dot)net

Thanks,
Aaron
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Old 1st February 2005, 07:25 AM   #14
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thanks for the info. ill take a look at he schematic once the weekend start.
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Old 2nd February 2005, 07:25 PM   #15
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Here is a schematic for a higher-power power supply. Notice the parallel switchers as well as the push-pull drivers used to increase the current supply to the gates. Also, this is a regulated power supply, unlike the one I posted earlier.
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Old 3rd February 2005, 12:45 AM   #16
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thanks but seeing these kind of schematic for the first time, itll take awhile to understand.

ill post any result later this week.

thanks again
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Old 3rd February 2005, 08:45 PM   #17
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am guessin my amp's power supply is design like the second schematic?
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Old 3rd February 2005, 08:53 PM   #18
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Quote:
Originally posted by TO-3
OUCH!!!!! That thing is old!!! When I worked at PPI, I had to fix a couple of those things. A PITA!!!! The thermal sensor should not measure low, so it may still be good. Unless it looks visually cracked. Like I said above, measure the switchers, the MosFETs in the power supply, to see if any of those devices are shorted.

TO-3,
Back in 1998, I heard that the PPI Powerclass Series was designed by some Ex-Krell engineers. Is that true? Cause I was suckered into buying a PC-2350 powering my woofers and a PC-450 bridged powering my highs. I just love those amps....

Are they as good as I think they are or not?

thanks in advance!!

K-
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Old 3rd February 2005, 09:55 PM   #19
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Quote:
Originally posted by K-amps



TO-3,
Back in 1998, I heard that the PPI Powerclass Series was designed by some Ex-Krell engineers. Is that true? Cause I was suckered into buying a PC-2350 powering my woofers and a PC-450 bridged powering my highs. I just love those amps....

Are they as good as I think they are or not?

thanks in advance!!

K-
Mr. Eichenbaum was the engineer that was from Krell, and ended up going back to Krell. As far as I know, he only designed the PPI-2500F1 and the PPI Tube Drivers' audio sections. I don't believe that he did any designs for the Power Class. The PC series is the same architecture as the Art Series, only with different chassis. The engineer that designed the PC amps originally designed the Xtant amps, left to work at PPI, then left to work for JL Audio.
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Old 3rd February 2005, 09:59 PM   #20
K-amps is offline K-amps  United States
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In your opinion, are they good amps?
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