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Bikerman
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Posts posted by Bikerman
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Ahh yes, thankx - Peak power :)
Ok, but the 81VAC (600W ish 8R) still seems high to me, as it says 300W RMS 8R on the back, and the external speaker is parallel connected to the internal speaker... -
I'm repairing a chinese amplifier for a subwoofer and don't get it
The amp powers the internal speaker and you can connect (in parallel) an 8 ohm 300W sub.
So I assumed that the amp would give 600W(ish) in 4 ohm, so that the marking on the bok fits (8 ohn 300W external sub)
But the capacitors witch is faulty was 100V (all of them blown), the transformer gives 81V-0-81V witch is about +/- 115V - should be enough to 1500W or there about?
or am I completely wrong? -
http://www.theregister.co.uk/2005/06/20/bofh_2005_episode_19/
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Nope, but it will probably give some "interesting" results :P
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Hi Ante
nope no realtime clock -
Just found that the 6502A runs at 2 MHz - but I don't know if it is with a 1 or 2 MHz x-tal
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Here are the schematics http://www.funet.fi/pub/cbm/schematics/computers/vic20/index.html
there is a CPU running at 2 MHz you can out stright in (can't remember the name), you don't need to change the x-tal (6502DX2 ?? 8))
when the VIC was hot you could buy a 4 MHz upgrade for it !!!, the problem with just changing the x-tal is your timing gets screwed, the timer and disk drive woun't work any more -
Yes, well, 1.01 to be correct ;D
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What chip ? - the CPU ? it is the 6502
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Looks more like RAM (the control for it) or the char. ROM
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The C64 is using a 6510 :P
One of the best places (I think) for Commodore stuff is: http://www.funet.fi/pub/cbm/
Miss my VIc-20 - it has alzhimers :'( - a known problem in old VIC's...
But all my C64, spectrum, lambda, amiga, spectra video, sort, amstrad, new brain..... still works 8) -
Try looking at these
http://pages.prodigy.net/rich_demartile/
something like that ? -
Yeah, been busy (got married and stuff) :P
on the last page of this post (page 3), there is a .pdf file called SMPS_POWER.pdf - with alot of examples of switchmode power supply's -
Hello
I am on the lookout for a 12V 3,33A powersupply (for a TFT monitor), the one on page 54 looks almost simple, and it gives 3,5A 15V but that can probably ber changed easy. But what about the T1, there is no description of that? - or have I just missed it
another question is, if the TFT goes into power save or gets switched off, can the switchmode PSU deal with that?? (or does it need a minimum load?) -
Just saw this one:
http://members.shaw.ca/novotill/UltrasonicPestRepeller/index.htm
I tried ultrasound through a piezo speaker, it did produce the 40 KHz I insertet but along with dosent other frequency's alot of them under 15KHz ;D
Come to think of it, I once saw a program for your PC they clame will do the job :D :D :D :D :D :D :D -
Ante
Nothing, need a +/- supply -
Ante
Well, What would I need 10A for anyway ;D -
Hmmm, nope
How about both? ;D
hmmm, do you know if the dual 0-50V can run as a 0-50V 10A and 0-100V 0-5A ? (serie and parallel connected) ??? -
Ante
hmm, I think thet the MJE4502 and the MJ4502 is the same... the ones I have is the MJ4502.. - atleast I'm probably gonna use them and see what happens....
I don't think that using the TO220 LM317 in stead of the TO3 is gonna be a problem...it shouldn't get that hot.... -
Ante
It would be nice to have the transformer all-in-one, but didn't really wanted the 5V supply..
I wanted to use the MJE4502 instead of the MJ15023 (if you read the text in the .pdf file besides the component list, they write MJE4502 as the power transistore, and they should be up to the job according to the spec.
still need to find the LM317HV, but if I can't find that one, I can get a replacement... can't remember the name though -
Ante
Carlsberg is always nice to have, no matter what the weather is ;)
I am going to build this or the dual you posted a while ago...but dunno witch yet
I did however get some (used) MJE4502, 10 pcs for 100dkr. ;D -
Hello Ante
Just tried to orden 10 pcs. the total prise was 155 sek. without tax.
In Denmark you can get 10 pcs. IRF9540 for 156.60 dkr. also without tax.. - ok, you can save a little :) -
Looks very good at first glance.. - The power MOS are hard to come by here in denmark, but the IRF9540 are easy to get, they should be ok, perhaps you can even get away with only using 8 or so...
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Hello
I'm new here, but I have been reading the forum for some time now (especialy about the 0-30 lab. PSU)
I just saw this, and it looks exiting.. how ever if someone desides to build it, there is a a drawing failure in the diagram!
Vcc on the opamp (pin7) should be connected to the "out" of IC1 (IC1's connection are also wrong, "out" is the case and "adj" is the leg).
R13, R14 (current set) and C7 should be connected to pin2 of IC2
New electronics hobbyist looking for good projects to start on!
in Electronics chit chat
Posted
Tons of circuit online
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/Improved_lamp_dimmer.html
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/Low_cost_lamp_dimmer.html
and so on
Don't go and kill your self :)