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Old 10th September 2010, 06:35 PM   #41
juma is offline juma  Serbia
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Quote:
Originally Posted by bogdan_borko View Post
You missed 10K/4n7 on output , they are the load too!
4n7 makes a LP filter together with drain resistors (1k). 10k is not functional part of the circuit. It just represents the possible Zin of the next stage.
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Old 10th September 2010, 06:38 PM   #42
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OK just to keep you happy.
Here is results of ZEN IV with 10k resistor and 4.7nF.
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File Type: png ZEN IVa.png (178.0 KB, 2064 views)
File Type: png ZEN IV FFTa.png (176.6 KB, 1989 views)
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Old 10th September 2010, 07:08 PM   #43
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OK let see what the elephant on the dance floor is doing.

Need I say this design kicks **** (Thats *** for my American friends)
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File Type: png ZEN IV IMD.png (180.0 KB, 1861 views)
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Old 10th September 2010, 07:32 PM   #44
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Well the Zen IV could also be classified as an opamp. I was referring to IC opamps.

I have done simulations if you are interested
see here
Zen I/V Converter
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Old 10th September 2010, 10:01 PM   #45
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Balanced Zen IV

FFT of 4Vpk into 50k load
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File Type: jpg Balanced Zen IV.jpg (126.5 KB, 1847 views)
File Type: jpg FFT of Balanced Zen IV.jpg (198.1 KB, 1759 views)
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Old 10th September 2010, 10:53 PM   #46
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That balanced fft is a mistake.
The correct balanced fft is below.
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File Type: jpg FFT of Balanced Zen IV.jpg (195.5 KB, 558 views)
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Old 10th September 2010, 10:56 PM   #47
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OK when are the pcbs available for purchase.
I will definitely be purchasing.
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Old 10th September 2010, 11:22 PM   #48
masag1 is offline masag1  Germany
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Quote:
Originally Posted by juma View Post
How about using 0.1uF instead of bulky 10uF? It's possible if the ZEN I/V is loaded by B1 running at approx. +/-10V (it's easy to scale down from +/-30V). Additional benefit is higher drive capability.
That is a quite good idea, juma!

I have a hypno board left (wise idea to buy some more).

How shall I do the down scaling? Just change the resistors for the same current as with 30V?

Greetings

Sam
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Old 10th September 2010, 11:59 PM   #49
juma is offline juma  Serbia
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Quote:
Originally Posted by masag1 View Post
...How shall I do the down scaling? ...
RC combo is the easiest way to do it (like R1/C1 or R2/C2 in ZEN I/V schematic). For example:
I make my buffers with BF862 running at 10mA. We want to loose 20V. So, we'll need 2k resistors rated at 0.5W at least. C member can be usual 220uF or less.

R2 sets the DC offset, buffer's Zout is approx. 50R. Schematic would look like this:
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File Type: gif ZenIVbuff.gif (5.5 KB, 1371 views)

Last edited by juma; 11th September 2010 at 12:19 AM.
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Old 11th September 2010, 01:04 AM   #50
rsdio is offline rsdio  United States
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Quote:
Originally Posted by regal View Post
Problem with this is you would be stuck with balanced ouput and the input would require 2 extra DACs. R2R DAC chips aren't chip or easy to find these days.
I do not understand why extra DACs would be needed (did you mean 2 total, or 2 extra? 3?).

Current-output DAC chips often have two outputs; each is a complement of the other. When the sample bits are loaded for conversion, each bit switches a fixed current to one or the other output, and thus the total current through the chip remains constant - and that's much better than having the total current load on the supply change frequently.

In other words, with a complementary current-output DAC, only one chip is needed.
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