I board mounted mine but it's part of the soft start:
It doesn't get hot enough to melt solder on the leads but you could crimp it to the wires, heat shrink and tie wrap those down to keep it away from things.
It doesn't get hot enough to melt solder on the leads but you could crimp it to the wires, heat shrink and tie wrap those down to keep it away from things.
fantasticly nice, MJL21193
softstart with thermistor
I must say some diy audio members are so very good, makes so very nice stuff
😎 Professional PRO Top Class level Product!
thinks lineup
-----
One question to you:
How much can that 'fuse' green wire take, before it 'burns'.
Myself, I have even used a very thin copper wire strand as one 25 Ampere Fuse .. once. But dont do this at home
.. use real fuses, Slow or Fast .. this depends on where and what circuit.
softstart with thermistor
I must say some diy audio members are so very good, makes so very nice stuff
😎 Professional PRO Top Class level Product!
thinks lineup
-----
One question to you:
How much can that 'fuse' green wire take, before it 'burns'.
Myself, I have even used a very thin copper wire strand as one 25 Ampere Fuse .. once. But dont do this at home
.. use real fuses, Slow or Fast .. this depends on where and what circuit.
lineup said:
Thanks lineup!
That was a temporary "fuse"(I ran out of 5mm x 20mm fuses) just to do some testing. The unit has a proper fuse in place now.
Okay. So I thought. Only temporary Proper fusing now.
Still I love your work, MJL21193 😎
One day soon I hope to re-start my own construction and practical designs.
your Lineup
Still I love your work, MJL21193 😎
One day soon I hope to re-start my own construction and practical designs.
your Lineup
My preamplifier skapre/optivol is in a cookie box.
Transformer is 15va from Hammond (partconnexion) excellent highly recommended!
Transformer is 15va from Hammond (partconnexion) excellent highly recommended!
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Cute cookie !! (I'm working up a sub woofer monoblock in a Tequila box w/ clear plastic top = should be worthy of cocktail party talk if nothing else.)
Nice practical use of wood as mount board = removable? 😀
Nice practical use of wood as mount board = removable? 😀
Thanks FastEddy
The pcb is glued but the wood is hold in place with metal screws.
The idea of the wood all over is to separate a little the parts from the case/mains ground; pcb's are 10 R over ground and volume control pcb is grounded on the case/mains. Signal wires are messy and trans is close but no hum or interference. I was supposed to put metal separators but it is now useless.
The pcb is glued but the wood is hold in place with metal screws.
The idea of the wood all over is to separate a little the parts from the case/mains ground; pcb's are 10 R over ground and volume control pcb is grounded on the case/mains. Signal wires are messy and trans is close but no hum or interference. I was supposed to put metal separators but it is now useless.
My DX HRII
Not to over-post (I have already posted pics in the DX thread), but here is my DX HRII amplifier submitted for "solid state" pics.
For more explanation and pictures check out this link.
I cannot believe how good this amplifier sounds.
Not to over-post (I have already posted pics in the DX thread), but here is my DX HRII amplifier submitted for "solid state" pics.
For more explanation and pictures check out this link.
I cannot believe how good this amplifier sounds.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Moderators Please delete my previous post - there is problems with hosting on local server.
Here is pictures of my Leach Amp 4.5 (Main construction details - Black anodized case, 4mm aluminum chassis and Transformer 800VA + 2x 30 000uF capacitors , other parts as described on Leach site) :
Here is pictures of my Leach Amp 4.5 (Main construction details - Black anodized case, 4mm aluminum chassis and Transformer 800VA + 2x 30 000uF capacitors , other parts as described on Leach site) :
You did a better job than most of the professor's students , close to the best classic leach build I've seen.
How does it sound ??
OS
Thanks ,
its sounds really great ! The case was not cheap and the costs exceed primary budget like always - Beauty demands sacrifices 😀 !
its sounds really great ! The case was not cheap and the costs exceed primary budget like always - Beauty demands sacrifices 😀 !
With that hefty power supply , it must rock the house !!
whatvoltage rails ?? what OP devices , MJ 15003/4 or 21193/4?? (barely readable markings)
PS
I know- the transformer is too powerful for this amp. Output transistors from Digi Key - MJ 15003/4G from ON and i hope they are genius .
Here is some internal pictures but i don't like how looks glued bias diodes - i will try to find some metal fixing bracket for them.
P.s.
I will learn and learn from other good DIY projects on this site !
😉
Here is some internal pictures but i don't like how looks glued bias diodes - i will try to find some metal fixing bracket for them.
P.s.
I will learn and learn from other good DIY projects on this site !
😉
sorry , the rails are 60.8 V DC on measured on filter caps without load.
Transformer 2 x 42V X 10 A
Transformer 2 x 42V X 10 A
Thanks.
2x60 VDC .. lots of power.
Here is one other Leach LowTim amplifier:
http://users.ece.gatech.edu/~mleach/lowtim/graphics/JMitchell.jpg
I am sure you have seen this picture, but others can compare.
That is a pretty large transformer, too.
Page link: http://users.ece.gatech.edu/~mleach/lowtim/
Maybe he would be pleased, Professor Leach, if you sent him an email with a couple of pictures.
Because your amplifier is good quality & a real Beauty.
just a thought
2x60 VDC .. lots of power.
Here is one other Leach LowTim amplifier:
http://users.ece.gatech.edu/~mleach/lowtim/graphics/JMitchell.jpg
I am sure you have seen this picture, but others can compare.
That is a pretty large transformer, too.
Page link: http://users.ece.gatech.edu/~mleach/lowtim/
Maybe he would be pleased, Professor Leach, if you sent him an email with a couple of pictures.
Because your amplifier is good quality & a real Beauty.
just a thought
Of course! i sent to him already few pictures and short description of my amp. I hope he will receive them.
Gabdx1 / Cookie Box Amp: " ... The idea of the wood all over is to separate a little the parts from the case/mains ground ..."
Many folks feel that wood can add to the overall sound quality as well ... But I have used wood where possible as simple insulator (as you indicate) and as a "removable" platform for parts without damaging the more esoteric containers (chassis'). My favorite is that thinner, multi-ply plywood that model builders like ... some of which is quite attractive ... 😉
Many folks feel that wood can add to the overall sound quality as well ... But I have used wood where possible as simple insulator (as you indicate) and as a "removable" platform for parts without damaging the more esoteric containers (chassis'). My favorite is that thinner, multi-ply plywood that model builders like ... some of which is quite attractive ... 😉
Uh huh, 🙄 The same people that spend 1000$ on speaker cables and suspend them in mid-air
. Wood is good for pure aesthetics (MJL , show the patchwork front panel) , many other materials are better as insulators (wood absorbs H2O).a wooden plywood circle could be used to set your 30lb. toroid on ,but a circle cut out of a polyethylene garbage can is far superior. 😀
OS