I'm a bit confused as to where and how to fit the Zener diode that goes on one of the output transistors. Does anyone have any info or even better a picture?
The Zener fit under the PCB on the IC Pin 7 is the Kathode the marked end the Anode fit on PIN 4, Pin 1 is marked on the chip/IC with a dot or a circle. Anti clockwise it goes 1,2,3,4, opposite 4 is pin5 then 6,7,8
I'm just about to place an order for the toroids from my own supplier because I believe there is a lot of difference between off the peg toroids and ones made specify for the job in hand.
Can I confirm that the two toroids need to be 2 x 18V, 6.25 A, Panel
If anyone else is interested in some super high quality toroids
rated at 350Va
Electrostatic screen
GOSS band
High quality core run at very low flux density Delivered for £150 for the pair, or if you wanted them at the specified 225Va then the price would come down, let me know.
Woop woop. Boards arrived today Colin. The postie reported that they had been making a lovely sound in the back of his van. Thanks again for this. I think I'm nearly ready to begin work... 8->
With regard to the M4 screws... Which of the various lengths (6, 8 and 10mm (12 currently not available)) would people see as being the most appropriate for attaching the boards to the heatsinks...?
For those about to build the Tracking psu you may find Farnell are out of most of the smd resistors, try RSComponents. Also Farnell no longer stock the relay - but I did find it at Mouser as 653-G2R-1A4-DC24. They are also out of 1N4004 diodes and the 10BQ100 smd diodes, both again are available from RSComponents.
I am about to build a second set of these boards and I will try to post pics of the build - hopefully as good as Colin's photos on the main amp board.
Having finished the cases for my first build I will post photos once I have cleaned the finger marks from them.
I can second that Mark. Trying something similar myself with my current amp build leads me to respect such craftsmanship all the more. (It actually makes me chuckle when I compare it to my efforts. ) Knowing the likes of Paul and Colin feels like an insurance policy when one owns special-and-no-longer-in-production kit! (second of course to valuing them as good blokes / mates!)
Despite Quickies exemplary build I am still going to publish my photos. They are of the completed amp since Colin's board build are so good plus I did not take any shots of the psu build (next time maybe).
The cases are made from 4mm ally and they are used as heatsinks for the tracking psu which generates a lot of heat.
These builds look great. Would also love to hear the differences the Dynamic psu makes as i've nearly completed mine. Having real trouble tapping my heatsink with M3 thread either with tap set or taptite screws. M4 taptites go in easy. I was thinking of using a strip of aluminium to attach the output devices to (M3) and them attach that to the heatsink with M4 screws. Does anyone know of a source of strips of Aluminium? All the places i can find are huge sheets.
Thanks for the help guys. I'll have another look tomorrow and take some measurements. The boards are all made just want to start hearing some music come from it
Comments
=D>
Cheers.
Electrostatic screen
GOSS band
High quality core run at very low flux density Delivered for £150 for the pair, or if you wanted them at the specified 225Va then the price would come down, let me know.
The postie reported that they had been making a lovely sound in the back of his van.
Thanks again for this. I think I'm nearly ready to begin work...
8->
Which of the various lengths (6, 8 and 10mm (12 currently not available)) would people see as being the most appropriate for attaching the boards to the heatsinks...?
At least 1.5 - 2 x diameter of thread.
OK. More details needed. I'll wait till I get the casing / heatsink and then I can have a proper look at what's involved.
Were you in Devon last week then ?
Trying something similar myself with my current amp build leads me to respect such craftsmanship all the more. (It actually makes me chuckle when I compare it to my efforts.
Knowing the likes of Paul and Colin feels like an insurance policy when one owns special-and-no-longer-in-production kit! (second of course to valuing them as good blokes / mates!)
My toroids are being made for me next week, so I better crack on with my build so when they arrive I'll be ready for them
I'm keen to hear Quickies view on how the amp improves with the use of Colin's psu
So am I James. Got nasty chest infection at the mo, so doing bugger all !
:-<
Alan, absolutely love the look there. It means business. And those heatsinks are positively mean!
If it's helpful I can get any type of aluminium made for you and pop it in the post
This is actually better then using the holes in the transistors ans the clamping force is more central and covers a bigger area
No, I havn't built its mate yet !
A nice pair