Scryer ... or how F8 met Mighty SissySIT

[codyt]

though, lately I'm making pcbs routing strictly in a way that mosfet (whatever) is sandwiched between hsink and pcb, so pins are always going upwards (same as you did show in last pic)

I’ve really come to like and prefer this mounting

 

[Zen Mod]

bummer

another thing I did not invent ......

 

[Zen Mod]

btw. Cody - doing something lately ......... ?

 

[Vunce]

….and I was ready to fabricate the T-bar mounting for Scryer 😂
First board is ready for power, P202 is set as max ohmic value. Will use lab supply and slowly ramp up🤞🏻

 

[codyt]

btw. Cody - doing something lately ......... ?

Sitting on my hands, trying to take a break

Actually… accruing parts for XA252. Soon…

 

[Plott]

Some progress, first power up maybe in two days or so.

 

[Zen Mod]

extra dirty wiring of additional caps

route power wires to amp pcbs ditto from Cap Bank pcb, connect additional caps with wires ditto in parallel with last cap of rail on Cap bank pcb; solder wires underneath

as is now, fat chance to get dirty GND to amp pcb

 

[Plott]

extra dirty wiring of additional caps

route power wires to amp pcbs ditto from Cap Bank pcb, connect additional caps with wires ditto in parallel with last cap of rail on Cap bank pcb; solder wires underneath

as is now, fat chance to get dirty GND to amp pcb

Thanks for the advice, I will try it and rewire it if it doesn't work properly.

 

[Vunce]

Good progress Plott.
Scryer is getting action this weekend!

Successful, drama free power up of left channel.
Bench supply +/-28VDC
1.7A bias current
5U 360mm heatsink is 45°C ~1hour
Q202/203 was a bit too hot for my piece of mind and changed to a larger heatsink, 10° cooler now .

Movin’ on the the right channel…..

 

[Zen Mod]

these 2 BD transistors ..... Pa is not even using heatsink for that sort of dissipation

ZM is Chicken

Vunce is double Chicken

 

[Vunce]

Definitely!

 

[Plott]

Regarding bleeder resistor, where is the best placement, at the input or at the output of the CRC power supply?
Many thanks

 

[Zen Mod]

output
but whatever
0R1 of difference, go figure

 

[Plott]

Thanks ZM, that's how I did.

 

[Vunce]

Another Scryer is Born!!
Vibrant and healthy 55pounder is singing away in the main system. Only a short time listening, but Scryer sounds real good so far. Super quiet at idle, no noise or hums heard right at the speakers .
A tiered dual mono psu using SLB's, Triad 250va 24v trafo's and SSR soft start board is all housed in a recycled multichannel amplifier chassis. The heatsinks are a fantastic size for this project 360mm x 210mm x 50mm. I will add speaker protection to Scryer but was a bit impatient and wanted to hear this amp sooner than later.
Thank you for this project ZM, it's a keeper!! What's next??

 

[G600]

Plott, you should also rotate the toroid 180°, with wires exiting opposite side of cap and circuit

 

[derekr]

Nice build! Like the donor organ holder!! Having repurposed a behemoth I can imagine the fun you had planning it. An unexpected benefit of donor chassis’ - the ‘can I do it different’ nights are half the fun 🙃

 

[codyt]

Lookin good, Vunce! Don't tell ZM, but I think those red caps make ALL the difference....

 

[Zen Mod]

Another Scryer is Born!!
Vibrant and healthy 55pounder is singing away in the main system. Only a short time listening, but Scryer sounds real good so far. Super quiet at idle, no noise or hums heard right at the speakers .
A tiered dual mono psu using SLB's, Triad 250va 24v trafo's and SSR soft start board is all housed in a recycled multichannel amplifier chassis. The heatsinks are a fantastic size for this project 360mm x 210mm x 50mm. I will add speaker protection to Scryer but was a bit impatient and wanted to hear this amp sooner than later.
Thank you for this project ZM, it's a keeper!! What's next??

Fugly!

How it sounds, makes you happy?

 

[Vunce]

Very happy indeed! 🕺🏻
Must be the red caps, Hehehe.

Derekr,
You got it! Lots of brainstorming and planning time for the PSU section. Most of the building time was this portion of the project. ZM’s Scryer boards were very easy to work with and whipped up quickly.