Two Macheens, both FAIL.

[ch1naski]

So I decided to etch my own macheen board, came out okay, and checked out good for continuity. Populated it, went to test it.....Nothing.
Dammit!
Since it's such a small circuit, component-wise, I decided to just do another, this time on vero, a Sabro layout (which he did using Brian's schematic)

Boom. Same thing.

After examining the traces/copper strips on both boards under a light, everything looked kosher, but just to be on the safe side I went between all the traces with an exact-o knife (I just recently bought a Hakko solder station,  but it arrived with a rather large chisel tip, so precision was not so good )

Still nothing on either board.

Well, time to bite the bullet and get out the audio probe. So I worked my way back, from the output.
And you know what ?
Both boards lose the signal after the drain pin on Q4 ( BS 170).

I've swapped the BS 170's out with a few others, and no love...

Before I go through and take voltage readings off the bjts, I wanted to check and see if anyone else has had this issue building this circuit.....I find it hard to fathom that I could screw up two different layouts of the same circuit, the same way....

I've checked the component values, in fact, I've gotten into the habit of reading all my resistors with my meter first. And everything is as it should be, as fast as I can tell.....I'll post a pic of the component and trace side shortly.
The more eyes, the better.....


Sent from my Nexus 7 using Tapatalk HD

[Hangingmonkey]

Im working on a vero of the macheen using the layout from tagboard. Ill post back with some results.

[ch1naski]

Please do....any help is appreciated.

Sent from my Nexus 7 using Tapatalk 4 Beta