[vgjako]

I have a dual-power supply which I am going to use to power my PPA V2. The power supply has three connections, +, - and G (Ground). So my question is: Can I use the + and - connections on my power supply to power the PPA V2, this gives me +/- 15 V. Or would I have to use + and G?
 
Thanks

 

[FallenAngel]

If you don't figure out the answer to this question, I would not recommend doing it.
 
It's certainly possible to run the PPAv2 off a split supply, and there may even be potential benefits to doing so.  Just don't install the TLE and wire ground there.  V+ and V- are left self-explanatory.

 

[vgjako]

So, can I connect the + connector on my PSU to V+ on the PPA, and the - connector to V- on the PPA and just ignore the G connector on my PSU?

 

[FallenAngel]

Uhm... no, that would be bad.  Don't install TLE, wire PSU ground to where the TLE is supposed to create ground.

 

[vgjako]

In Tangent's guide it says: "If you have a dual-voltage power supply, it's probably better to run the amp from the outer terminals and ignore the ground lead than to try and hook up the ground lead"
 
Doesen't this mean that i can do what I asked about above

?
 
If I understand you correct, I should run the ground lead from the PSU to the ground plane of the PPA V2, and just jumper across all the TLE positions and wire + and - from the PSU to V+ and V- on the PPA V2?
 
What voltage would the op-amps get then, I am using the DACT CT-102 PSU, which is selectable between +/- 15 V, and +/- 20 V.

 

[FallenAngel]

Some supplies don't like working without the ground tap, I figure, why ask the TLE to make a split supply when there's one already there.
 
Voltage choice depends on opamp choice.  +/- 15V is... well 30V.  That's more than enough for any opamp.  40V will likely be too much.

 

[vgjako]

Ok, I get you.

Thanks for taking the time to explain it to me.

 

[vgjako]

One last question: Am I supposed to leave the TLE positions open or jumper them? I would guess I should leave them open, because if I jumper them it would mean that VH+ and VH- will be connected to ground, am I correct?

 

[FallenAngel]

Uhm... your questions worry me.  You can simply install the TLE and wire the PSU while leaving the ground alone, or something might burn up.

 

[vgjako]

Hi,
 
I have drawn a schematic which shows how I think it should be done:
 

 
As you can see, I am running the ground lead to the ground plane. I am measuring 30 V from + to ground, everything seams to be working well. Wouldn't this configuration be correct, isn't this what you meant? In other words I am leaving the TLE's open and running the ground lead to the ground plane.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

[MisterX]

Omit the TLEs (do not jumper them!), jumper D1, I would also jumper the switch positions and omit the LED on the PPA board, connect the + output from the power supply to the V+ input on the amplifier, connect the - output from the power supply to the V- input on the amplifier and connect the ground from the power supply to one of the IG pads on the amplifier.

 

[vgjako]

I have trouble sourcing parts, so I was wondering if anyone had some PN4392's laying around, I will need at least nine of them, more would be better. I also need the output transistors, MJE243 and MJE253, I need at least 3 of each. I can pay via PayPal.

 

[MisterX]

Did you try Farnell?
 
http://no.farnell.com/fairchild-semiconductor/pn4392/transistor-jfet-n-to-92/dp/1471025?Ntt=PN4392
 
 
Kunder som kjøpte dette produktet, har også kjøpt:
 
MJE243G
MJE253G

 

[funch]

Quote:

I have trouble sourcing parts, so I was wondering if anyone had some PN4392's laying around, I will need at least nine of them, more would be better. I also need the output transistors, MJE243 and MJE253, I need at least 3 of each. I can pay via PayPal.

     I have 3 of each of the 243/253.  PM me if you still need them.

 

[vgjako]

Quote:

Did you try Farnell?
 
http://no.farnell.com/fairchild-semiconductor/pn4392/transistor-jfet-n-to-92/dp/1471025?Ntt=PN4392
 
 
Kunder som kjøpte dette produktet, har også kjøpt:
 
MJE243G
MJE253G

Farnell only do business with companie's, they don't take credit card's. The only thing I could do is to order the parts through my school.


 
Quote:

     I have 3 of each of the 243/253.  PM me if you still need them.

You don't have any PN4392's?