Welcome! Need support, you got it. Or share you ideas and experiences.
Yesterday I picked up the chassis parts for my fplay mkII from Scott (aka RFGumby). I got the pre amp part clear coated and the power supply painted last night so today I get to build. Here are a few pics of what it looks like now. Will post more as I build.Andrew
Follow Ups:
Could you post a list of ingredients? I'm intrigued by those small Hammond transformers, presumably for the heater supply?As for the voltage drop to 157, you should be able to measure the current across your next to last resistor and use V=IR to figure the value resistor you'll need for the next drop.
The hammonds are for the HV, the mfg number is 187B120. The heaters have their own 12-15v power supplies. I will work on a list later if thats cool, a bit busy at the moment. I am thinking about trying Paul Joppa's idea and leaving the hv be and seeing how that goes.
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Sure, all that time making that cool chassis for the
audio section, and you post power supply pics ;)Glad to hear you got the clearcoating and PS painting
out of the way, that thing is gonna be seriously nice.
Aren't you glad you didn't skimp on the parts? Everyone
on the forum should have a DACT with a 1 pound brass knob
in their FP. Not a better rich, high end feel can be had
from my experience. Oh, and I'm sure it'll sound great too.
I really liked the DACT when I upgraded to it a month or
two back. Way more clarity than the ALPS Blues we've had
been using.Oh, and twist those heater wires tighter in the PS, the
pic shows not enough twist. Should be 1-2 twists every inch.
very nicely.
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I finished the power supply. The voltage after the filter caps (terminal 11 on a reg fplay) is 202 volts. The voltage after the diodes is 204 volts. I have 3 220uF panisonic caps with 2.2k resistors inbetween. Any ideas on how to lower the voltage? ThanksAndrew
Ok, sorry for the unclear post, I will try and be more clear.I am building a dual mono power supply. I am using Hammond 187B120 power transformers that are 115v primary and 120v secondary. From there I have the RRSF then a diode bridge using 1UF4007s. Then 3 220uf caps with 2.2kohm resistors in between.
That is for each channel.
The voltage after the diodes is 204 volts and after the caps it is 202 volts. This is just the power supply being tested, with no load. How do I figure out what resistor values to use to get the voltage to 157 or somewhere around there? Thanks
It will drop under load. And 200v is fine for the Foreplay, unless it exceeds the capacitor's rated voltage. (In that case, a resistor ahead of the first cap will bring it down.) Note this is the loaded voltage - electrolytic caps have a surge voltage rating that is higher than their "working voltage" rating.
Ok, I will give that a shot.Thanks
Looks beautiful already. Hey - where did you get that cool Wolfenstein logo? LOL! Neato!
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