Easy-to-build I/V stage

Jocko Homo · 18th September 2002, 01:59 PM

I have had several requests for my I/V board. SInce they are now all gone, here is something you guys can throw together to hold you over until I build some new ones. It is close (distortion is -70 dB vs. -80 dB; input Z is 5 ohms vs. 0.1 ohms).

Hey, you really didn't think I was going to give you the good one for free did you? [joke]

You may need to tweak the current slightly of either CCS to get the collector of Q2 to a decent voltage. And also R4 to get the emitter of Q2 at exactly 0.0 V. (You guys need something left to try by yourselves.....I'm not going to do it all for you.) [joke]

Jocko

dice45 · 18th September 2002, 02:14 PM

Jocko,
why must that output coupling cap be so huge? 100µ? Does the circuit only work with 2k5 output load?

sonnya · 18th September 2002, 02:31 PM

hi hi hi hi hi hi hi!!!!!

Jocko .. nice circuit!

Sonny

mlloyd1 · 18th September 2002, 03:09 PM

NICE! Thanks Jocko. Looks like I have something to play with over the weekend.
Hey, I must have missed that you had boards for this. I though your DAC boards didn't include IV conv, right?
mlloyd1

Jocko Homo · 18th September 2002, 03:24 PM

1.) Why so big?

I picked the part closest to me on the work bench.

2.) Other values work too. I use around 4K.

3.) I had some old I/V boards laying around since '89. Some one asked if I had anything to go with the DAC board, and the next thing you know, they were all gone.

New ones......eventually.

Jocko

sonnya · 18th September 2002, 05:02 PM

will q2 or q4 not go into saturation?

Sorry i ask.. but..

Sonny

Elso Kwak · 18th September 2002, 05:21 PM

Hi Jocko,
Nice to see you back. I thought you had left us.
I see a common base amplifier between to current sources or should I say between current source and current sink?
My problem is I don't like common base amplifiers....
All the best.

Jocko Homo · 18th September 2002, 05:24 PM

If you carefully adjust the current, it will work.

Yes, it is a common-base. Not an RF engineer, eh? I am, so I do.

Jocko

sonnya · 18th September 2002, 05:52 PM

Yes.. times go fast!

Sonny

peranders · 18th September 2002, 06:52 PM

Quote:

Originally posted by Elso Kwak
My problem is I don't like common base amplifiers....

May I ask why?

18th September 2002, 02:14 PM	#2
dice45 diyAudio Member Join Date: Jan 2002 Location: Munich, Bavaria	Jocko, why must that output coupling cap be so huge? 100µ? Does the circuit only work with 2k5 output load? __________________ Greets, Bernhard

18th September 2002, 05:21 PM	#7
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	IV Converter Hi Jocko, Nice to see you back. I thought you had left us. I see a common base amplifier between to current sources or should I say between current source and current sink? My problem is I don't like common base amplifiers.... All the best.

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18th September 2002, 02:31 PM	#3
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	hi hi hi hi hi hi hi!!!!! Jocko .. nice circuit! Sonny

18th September 2002, 03:09 PM	#4
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	NICE! Thanks Jocko. Looks like I have something to play with over the weekend. Hey, I must have missed that you had boards for this. I though your DAC boards didn't include IV conv, right? mlloyd1

18th September 2002, 03:24 PM	#5
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	1.) Why so big? I picked the part closest to me on the work bench. 2.) Other values work too. I use around 4K. 3.) I had some old I/V boards laying around since '89. Some one asked if I had anything to go with the DAC board, and the next thing you know, they were all gone. New ones......eventually. Jocko

18th September 2002, 05:02 PM	#6
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	will q2 or q4 not go into saturation? Sorry i ask.. but.. Sonny

18th September 2002, 05:24 PM	#8
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	If you carefully adjust the current, it will work. Yes, it is a common-base. Not an RF engineer, eh? I am, so I do. Jocko

18th September 2002, 05:52 PM	#9
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	Yes.. times go fast! Sonny

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