New Stasis front end

[Zen Mod]

exact footprint, that type (length) is more than good enough

use highest/longest you can find, if you're Chicken, as ZM

 

[Blk Dynamite]

A quick check at Mouser shows the 984-ATS-PCB1014 will fit.

AH!! So close enough and not exact is cool. The boards are so compact i was thinking the tolerance was every small. Thanks yo

 

[Blk Dynamite]

exact footprint, that type (length) is more than good enough

use highest/longest you can find, if you're Chicken, as ZM

Man i was the kid that jumped off roofs into pools so no worries, there’s no chicken here

Thanks for the insight dude

 

[gary s]

There are a lot of other heat sinks with that footprint as well. As ZM states, buy the highest/longest ones you can find.

 

[experimental]

Squarewave

I applied square waves at 1k and 10k. I didn't see any ringing, but the leading edge was rounded. This could be a function of the cheap signal generator I'm using. If anyone else is inclined to check this out, I'd be glad of that.

NP original FE board: I also tested the board with a good arbitrary function generator. Also observed your results. At the beginning I thought it was related to the ground, however it did not matter how it was connected relative to the ground. Finally I ended with the T open. but still no a reasonable squarewave was obtained. It does not happen under a sinewave. Will post some pics when i figure out how to take pics from by computer monitor.

Any adviced is greatly appreciated.

 

[Zen Mod]

check sig. gene alone with scope, then you'll know what's going in DUT

T pads must be closed/shorted for proper operation

there goes thermal switch on heatsink, NC (normally closed)

say 65-70C

 

[Zung]

... Will post some pics when i figure out how to take pics from by computer monitor...

The Prt Scn (print screen) key is your friend. Alternatively, your smartphone will do.

 

[experimental]

Squarewave

One file with squarewave over impose, the other split.

Advice??????

 

[experimental]

Squarewave

I got this by short the ground to the input negative. I think I need to understand how the board have to be grounded and my problems will be solved.

 

[Zen Mod]

you either need to feed FE with signal in balanced way ( both inputs, XLR) or SE ( one input, RCA, other input grounded)

you ought to need that

 

[experimental]

Squarewave

ZM, thanks for your help. look at the squarewave now. The 10K a little noise but that got nothing to do with the board.

 

[Zen Mod]

you know old rule - Garbage in, Garbage out

as long Garbage at your DUT output is same as Garbage in, you're good

and with Garbage signal, you can't look for anything more precise (leading edge etc.)

 

[gary s]

As usual, it does not pay to buy the cheapest piece of test gear going, remember the old adage - you only get what you pay for these days.

 

[Zung]

I (also) own and use (sometimes) the cheapest (<$5) function generator this side of the galaxy; and it's by far not as garbagy as this. Maybe the scope?

 

[Nelson Pass]

In this case the test equipment was adequate.

 

[experimental]

Squarewave

I have reduce the noise, better grounding as you can see from the pic. You can see the edge rounding up better now. 10k squarewave. The arbitrary generator is an afg-2105 calibrated against a Keysigth Arbritrary Wave generator. However, the scope is a cheapo pc install in my pc (Noisy). However for future analysis I will bring home acalibrated tektronik 300 mhz which is available.

 

[gary s]

The AFG-2105 should be fine, it will be interesting to see what a Tek 300Mhz real scope shows compared to your PC scope.

 

[Zen Mod]

looking at these pics, you don't need scope for rest of build

besides - no porn, no glory;

how do we know that you're measuring real FE?

 

[Zen Mod]

btw

this FE will transform any of your old Hafler in proper beast

realized that realizing that I have cleaned (inside) Hitachi HMA-6500, as possible radio/tv/summer amp for living room, waiting for resurection .......

anyone with spare pair of small FE pcb, for poor soul ?

 

[hirscwi]

ZM, I have a pair of the small FE boards you can have. Just send me a PM with your address.