[steinba]

I've populated a Pimeta V 1.1 board, and I'm wondering about two (optional) diodes in the parts list called "CRD" (Current regulating diode) and "Current source configuration; CRD". What are these supposed to do, and where do they go?

I'm running this off a Tread and a 24V wallwart. The source will be an Alien DAC. (...As soon as i can build a working one.) This will be my "laptop sound survival box".

 

[FallenAngel]

To be used instead of Q1/Q2, I'd just stick to the JFET cascode.

 

[TzeYang]

JFET Cascode has a higher impedance and better performance across frequencies. But also means lower voltage headroom and the need to match them.

CRDs are factory trimmed to 10%+/-. It's not exactly perfect, but saves the headache of matching. You can apply them directly. They are in fact, single trimmed JFETS running in saturation (IDSS)

 

[steinba]

Quote:

Originally Posted by FallenAngel /img/forum/go_quote.gif To be used instead of Q1/Q2, I'd just stick to the JFET cascode.

Ahh, OK. I've populated Q1s and Q2s, so I'll just leave them, then.

Thank you.