208p build thread (papz's PCBs)

[friedemann]

Sometimes only sequence LED 1 lits but same behavior.

[papz]

There's most likely a same build error on both cards, double check all.
Just in case, there is no 4016/4066 on card 1.

[sendepause]

Question:
I have build a 208 ( not Papz) and there is a lot of knowhow in this thread I put the question here.
So how noisy is your 208? I have a new card 12 installed and without any cards, except the 12, there is some serious noise on the output. Headphone out is a total no go.
I’m doing a open heart surgery atm and check everything on the motherboard and can’t find any weird things.
So: is your 208 noisy as well? How noisy? Headphone out noisy?

Well...
I contacted the great Dave Brown about my problems. After some emails back and forth, we managed to localize the problem around the headphone output. When I desoldered the electrolytic caps, the noise was almost gone. So we even narrowed it a bit more, specifically to the 12v rail. And after some more measurements and emails, we couldn't find the problem. I did have a very noisy Cincon power supply and my last try, before giving up and send the 208 to the doctor, was buying a new power supply.

Guess what... Problem solved! When I plugged it in and there was no noise, I could almost cry with happiness hahaha

Albeit not a papz 208, there is another working easel on the planet!

[thecivildefense]

Can someone help me understand the Tinijax wiring for the Switchcraft 42a for the preamp in on the panel? So I get tip is supposed to go to card 10. Ring to ground wherever. But what about the switched connection?

Also I know tinijax and 3.5mm cables are different sizes, but also that 3.5mm should work here. BUT I'm noticing if I use a 3.5mm cable here (don't have tinijax yet) it seems to NOT break the switched connection. If the function is to short to ground w/ no cable plugged in I'm assuming this won't work then w/ 3.5mm if it's not switching.

[Don T]

Can someone help me understand the Tinijax wiring for the Switchcraft 42a for the preamp in on the panel? So I get tip is supposed to go to card 10. Ring to ground wherever. But what about the switched connection?

Also I know tinijax and 3.5mm cables are different sizes, but also that 3.5mm should work here. BUT I'm noticing if I use a 3.5mm cable here (don't have tinijax yet) it seems to NOT break the switched connection. If the function is to short to ground w/ no cable plugged in I'm assuming this won't work then w/ 3.5mm if it's not switching.

Wire the switch to ground. I.e., the tip contact should be grounded when not in use.

[papz]

Here's a pic.
The green cable is signal, soldered to the tip.
The shielding is ground, connected to both other tabs via a piece of component lead.

IMG_1671.JPG

Some minijack plugs work in tinijax sockets, others don't.

[thecivildefense]

Here's a pic.
The green cable is signal, soldered to the tip.
The shielding is ground, connected to both other tabs via a piece of component lead.


IMG_1671.JPG


Some minijack plugs work in tinijax sockets, others don't.

Perfect. Thanks all. I'll have to remember to use a proper tested cable when I finish the build so I make sure the cable breaks the normal.