F5 Turbo Circuit Boards

[UKToecutter]

That seems like a reasonable table of values to minimise the resistance variation due to temperature induced effects when very high transient signals pass through.
A normal F5 runs on +-25Vdc supply rails so the table could be completed by adding in a 20Vpk output and using a 600mW resistor. We are back to the original now.

Andrew,
I wonder if you'd consider adding a couple of columns for me.
+- rail voltage and maximum output power.

I think alot of builders would find it very useful (I certainly would).

Regards
Andy

 

[AndrewT]

There seems to be a fundamental disagreement on the voltage drop from the +-V supply rails to the maximum voltage peak delivered to a resistive test load.

A table of supply rail to max power cannot be done until that disagreement is removed.

 

[UKToecutter]

Andrew,

Ok, no problem. I guess that can wait for the test builds.

Andy

 

[jackinnj]

The Panasonic ECG resistors can take a lot of punishment -- but they do like to be off the PCB a bit so air can circulate.

 

[bear]

For best sonics, imo, oversize ALL resistors.

My rule of thumb is to run them at <50% rating.

_-_-bear

 

[a.wayne]

Sounds reasonable bear ........

 

[AndrewT]

For best sonics, imo, oversize ALL resistors.

My rule of thumb is to run them at <50% rating.

_-_-bear

and when in the feed back loop ~10%

 

[bear]

me? reasonable?

Ha!

I also like fat traces and big pads... space on the board (if possible)...

_-_-bear

 

[labjr]

I also like fat traces and big pads... space on the board (if possible)...

_-_-bear

Same here. It doesn't cost any more to leave more coopper on the board so why not? The extra space costs but I don't care.

 

[Bksabath]

me? reasonable?

Ha!

I also like fat traces and big pads... space on the board (if possible)...

_-_-bear

Duly noted

 

[UKToecutter]

I also like fat traces and big pads but I also like compact boards.

 

[labjr]

I also like fat traces and big pads but I also like compact boards.

I don't see the need to have a crowded board if it isn't neccessary.

 

[Bksabath]

I don't see the need to have a crowded board if it isn't neccessary.

Especialy when things get hot

 

[jacco vermeulen]

Alternative would be to gang-shabang for 10R in TO-126.
Means switching positons of R5/R6 and the testpoints, to make room for a heatsink.

(Caddock MP915 for under $2 or Bourns PWR221T at $1.35, for 100 up)

 

[a.wayne]

I like them Phat too, does get hot .......

 

[UKToecutter]

I don't see the need to have a crowded board if it isn't neccessary.

Fair enough.
They're not crowded at the moment anyway.

 

[UKToecutter]

Alternative would be to gang-shabang for 10R in TO-126.
Means switching positons of R5/R6 and the testpoints, to make room for a heatsink.

(Caddock MP915 for under $2 or Bourns PWR221T at $1.35, for 100 up)

Jacco,

What are the pin spacings for those?

 

[UKToecutter]

Jacco,

Found the datasheets for both models.
They are both 5.08mm spacing so are already catered for on the boards.

 

[jacco vermeulen]

Me knew that before i typed.

 

[Abraxas336]

Heat sinks for rectifiers are big enough? In my F4s 8 Hexfreds heat up a black anodized 300mm x 300mm x 6mm aluminum ground plate to almost 60°C (after a day or so).

Regards
Sven