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Thread: PL 3300 Series II rebuild/upgrade

  1. #51
    Forum Veteran WOPL Sniffer's Avatar
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    Screw it
    Well, they seem to be working just fine. (the + and - 15 regulators)......

    The connectors don't fit but a piece of wire fits just fine. As I said earlier, with 12 regulators in instead of 15's and it should work great too.


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    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
    Kenner Close N Play

  2. #52
    Forum Veteran scottonnob's Avatar
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    ---
    Wow! I just received a pair of boards from Perry. I guess I wasn't paying attention, because I thought I was just buying the empty PCBs. However, I opened the box and found fully populated boards ready to be installed. Great bargain. A hell of a contribution to the PL community. Many, many thanks to Perry for all the time and energy it required to have these boards produced.

  3. #53
    Forum Veteran WOPL Sniffer's Avatar
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    Screw it
    It keeps me busy and out of trouble... Hook one up and check it out, should work fine...

    I do have a few left
    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
    Kenner Close N Play

  4. #54
    Forum Veteran Northwinds's Avatar
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    Fondler errrr... fan of all Nav's avatars
    You are amazing Perry, don't understand shit what the boards are for but if you built them, there is a very good reason and your work is always stellar

    I will be giving you a ring this week anyway. I have a few questions to ask you anyway about the Technics TT
    "I really can't begin to describe what happens at that frequency when you hit that SPL, but it's serious. We saw a mouse stagger out of a crack in the concrete floor and die"
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  5. #55
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    The purpose of the regulators is to keep the +/- outputs at 15 volts over a wide range of input voltage. The spec (P.3 of the manual) says the range is 90-132 vac. 132 is 10% high from a nominal voltage of 120 volts. 90 volts is 25% low from a nominal 120. Typical power supply design is +/- 10% from nominal. I would suggest using a variac to drop the line voltage to 108 VAC and make sure the input voltage is still above the minimum input for the XX15's. If it's borderline use XX12's.

    It wouldn't hurt to put a reverse clamp diode (1n4004) from input to output of the regulators to make sure the output cap of the regulators discharges properly at turn off. To do this on the 7815 the anode of the diode connects to the output, the cathode (band) connects to the input. The polarity of the diode reverses for the 7915. If a scope is available look at the output of the regulator with the variac set at 108 VAC and make sure it doesn't oscillate or show other signs of instability.

    I just noticed that the schematic Perry posted has reverse clamp diodes from output to ground. Although it won't hurt anything they probably won't do much either.
    Last edited by wattsabundant; 05-15-2018 at 11:41 PM. Reason: add comment about Pery's board

  6. #56
    Forum Veteran WOPL Sniffer's Avatar
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    Screw it
    Quote Originally Posted by Northwinds View Post
    You are amazing Perry, don't understand shit what the boards are for but if you built them, there is a very good reason and your work is always stellar

    I will be giving you a ring this week anyway. I have a few questions to ask you anyway about the Technics TT


    It has been a while since we have yapped on the phone.... Gimme a call anytime...
    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
    Kenner Close N Play

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