MJL21193 said:
Well he did say (if I remember correctly) that he thought he could build an amp cheaper than buying one. More than one person recommended a used pro amp as the logical alternative.
If he simply WANTS to build his own, then that's great. Those of us that have built amps, especially high powered amps, should and are trying to tell him it can cost considerably more than it seems at first. I have no desire to stop him from doing what he wants. I also have no desire to see anyone spend more for a stated goal than necessary.
I'm one of the "lucky" ones that spends 99% of their time chatting and dreaming, plotting and planning, advising and posturing. I wish I could get my hands dirty again.
MJL21193 said:
i have some of the basics, but looking at a dual trace scope right now, electronics has always been one of my favorite past time along with wrenching on cars.
i haven't given up on on my "monster"... The boards are made, caps and rectifiers i have already and to top it all off, output transistors have been ordered (100 in total) that supossed to be here by friday.
EDIT...
Need a new soldering Station as well since my weller pencil is about 8 years old now...
Whats decent these days ??
kubeek said:
Nope just a plain plug in...
looking at one with a good controller and expansion capabilities for SMD 😀
Adrculda said:
Pace make cost-effective soldering stations for SMD, with plug-in tips for temp. control.
Attached is a prototype build of a (working) USB mains controller that I whacked up at work.
The USB UART (CP2102) has a lead pitch of 0.5mm. Pins soldered by hand, individually with a fine tipped Pace iron and a crappy 1960's lab microscope.
Cheers,
Glen
Attachments
If ur just looking for a standard soldering iron, there is a $39USD Weller that has adjustable temp... almost everyone is selling them, including on ebay. You can find used WTCP Wellers and similar on ebay, they are temperature controlled boxes... various models are similar and parts available.
_-_-bear
_-_-bear
OK guys...
down to the nitty gritty now...
need to to invest in some decent equipment..
Has anyone heard of Madell ???
they seem to have a lot of equipment, but makes me wonder if it is accurate for stereo repair...
What do you guys think of this Scope as i have made an offer on this....
i think that would be plenty for a seasoned amateur...
down to the nitty gritty now...
need to to invest in some decent equipment..
Has anyone heard of Madell ???
they seem to have a lot of equipment, but makes me wonder if it is accurate for stereo repair...
What do you guys think of this Scope as i have made an offer on this....
i think that would be plenty for a seasoned amateur...
the price is the problem...
go for an older Tektronix 100Mhz or better scope.
I got an older Phillips that actually is quite nice... cost $30 at a hamfest... 100Mhz, dual trace.
Apparently you have $$ to burn.
Why not spend the money on a good pro amp? 😀
_-_-bear
go for an older Tektronix 100Mhz or better scope.
I got an older Phillips that actually is quite nice... cost $30 at a hamfest... 100Mhz, dual trace.
Apparently you have $$ to burn.
Why not spend the money on a good pro amp? 😀
_-_-bear
bear said:
As i mentioned Earlier... when i posted that i already have made an offer on that Scope and i won it...
as far as the specs go though....
i think that's plenty for the average hobbyist that only farts around with this on their spare time.
what about a signal generator and a programable PS...
is it worth it for someone that like to screw around with circuits in their spare time ??
Adrculda said:
I built amps for years without an oscilloscope. Never anything this big, but several DC300A-size that still work. I have a huge Tektronix that I rarely use. Mostly I end up using my 15 year old MCM-Electronics special (was about $400). The good one is needed for doing switching supplies and such, but for audio it just don't take that much. If you wanted precision measurement capability the better instrument is needed, but to make a big amp *work* you just need to see obvious distortion.
Signal generator = computer, sound card, and Speaker Workshop. Source of 60 Hz test tone w/o computer = output of 6.3V transformer.
I don't like programmable power supplies. I prefer a 10-turn pot on the front panel. BTW, building power supplies is very good practice for building amps.
designing and building good (linear) power supplies is just as demanding as, designing and building good power amps. So definitely good practice.wg_ski said:
In an audio amplifier you can't cheat by putting a big 2000µF capacitor across the output to get low output impeadance at high frequencies like in a linear PS 😉
The power ratings of transformer, rectifier and pass transistors is much more critical in a linear PS though as there might not be any 10:1 crest factor like in music saving you from meltdown...
The power ratings of transformer, rectifier and pass transistors is much more critical in a linear PS though as there might not be any 10:1 crest factor like in music saving you from meltdown...
Adrculda said:
I think that only this super tool it suits for the demands and for the economic ease of you:
A Weller WR3000M station.
An externally hosted image should be here but it was not working when we last tested it.
Forget used tools.
It costs only 1775 itchy dollars. A fume extractor also it is a must to care your health. With the rest accesories needed to make any solder-desolder work, you can spend arround 3500$.
If there is any dollar left over, please share it in all of us the penniless. 😀 😀 😀
Regs
Fotios
Stay away from (or resist the conversion to) surface mount and you can be perfectly happy with a $30 non-controlled Hakko soldeing iron. If you have to go to surface mount parts for part of your project, get two irons. Plug the second into a (home-brew) motor speed controller - the kind with an SCR or triac and use it only for the delicate stuff.
wg_ski said:
Heeeeeeyyyyyyy....
Dirty Harry is not a clone of CS800. To be accurate, only the output stage (excluded the VI limiter) from predrivers up to the zobel it is a clone of CS1200. The rest circuit from the input up to the VGS and Vbe multiplier, it is absolutelly different from any Peavey amplifier.
Also, i can't understand what is the old school. Is there any new school? Like class AB amplifiers (similar with those of old school) supplied from SMPS?
Fotios
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