Maplin 150w MOSFET regulation? - Page 3 - diyAudio
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Old 31st May 2006, 05:26 PM   #21
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Bangs are fine when something's sitting on the bench, it's when it's in the rack playing music that I get annoyed!
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Old 31st May 2006, 05:43 PM   #22
ash_dac is offline ash_dac  United Kingdom
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Hi,

I couldn't find the maplin kit. Do they still sell it ?



Many thanks,

Ashley.
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Old 31st May 2006, 05:48 PM   #23
cpemma is offline cpemma  United Kingdom
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Quote:
Originally posted by ash_dac
I couldn't find the maplin kit. Do they still sell it ?
Not sold it for several years. Maplin went the way of Radio Shack, more emphasis on toys and computer stuff, less on components and the electronics hobbyist.
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Old 31st May 2006, 07:31 PM   #24
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Thanks for replys all, especially traderbam for your circuit diagram which i will be using, not sure on which drive transistors to use yet ill see what i have lying around.
I am going to go ahead with the regulator for this amp despite all the warnings you guys have given me about heat
If it doesnt work out practical in the end it will be a learning experience for me at least.

im gonna whack in a 50-55v zener in after the regulators so if they do pop my circuits will be protected and the HT fuses will pop first along with the zeners.
This seems like a safe idea.

Cheers
Craig
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Old 31st May 2006, 09:06 PM   #25
cpemma is offline cpemma  United Kingdom
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Quote:
Originally posted by Craig405
...the MOSFETS ...they are fairly rare now and i only have 3 pairs.
The circuit (& kits I assume) was updated & bugfixed late '90 as some parts got scarce, is that what you have? Mosfets 2SK135 & 2SJ50 in the newer version. I have the Maplin Mag construction article if you need any info.
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Old 31st May 2006, 10:31 PM   #26
latala is offline latala  United Kingdom
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Connect you Zeners to a pair of large thyristors and turn it into a crow bar
I have used this myself many times with great success
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trev
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Old 1st June 2006, 01:58 PM   #27
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cpemma, I do have an article from Maplin on the modules but it is dated 1987.
If you have a newer article i would be interested to see it. yes the MOSFET's are 2SK135/J50, Interestingly my article definatly specifies the max operating voltages of the module to be 50v not 55v, i wonder if the design had changed by 1990?

I am about to begin construction of my regulators, haha the weather in south england may be cruddy today but ill be warm

Craig
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Old 1st June 2006, 03:56 PM   #28
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Just wear an asbestos body suit and welding visor before power-on. On reflection, you can afford to increase R1 and R3 to 2k to reduce the power dissipation of the zener a little. The hot air from the 3055s might make them sweat a little.
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Old 1st June 2006, 04:08 PM   #29
cpemma is offline cpemma  United Kingdom
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Quote:
Originally posted by Craig405
cpemma, I do have an article from Maplin on the modules but it is dated 1987.
If you have a newer article i would be interested to see it.
1991 circuit and a few details here.

The blurb says "a few minor improvements made to ease assembly and improve reliability" over the original design. Claim 20Hz-40kHz, sensitivity 860mV RMS for 100W/8R.
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Old 1st June 2006, 04:58 PM   #30
AndrewT is online now AndrewT  Scotland
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Hi,
is Cpemma's site down?
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