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Op amp Linear power supply
Op amp Linear power supply
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Old 22nd January 2018, 02:58 PM   #151
MorbidFractal is offline MorbidFractal
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Default Gain Peaking in an I to V converter.

Some words to the thoughts.

I had mentioned the possibility and that was based on something in the back of my head mentioned somewhere else.

Picture 1) Classic I to V converter circuit.

The input current source represents the photo-diode.

Picture 2) Classic I to V converter with diode capacitance.

Voltage gain is RF/RIN.... Guess What?

Picture 3) Adding input resistance to tame things.

Without thinking harder, flying in the fog, I have no idea what the trade offs might be.

Oh.. your new .asy looks like the old .asy but you might see from my circuits that I have being messing about with the .asy to get pretty circuits. Right click, open symbol, mess about and save.
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Old 22nd January 2018, 03:04 PM   #152
MorbidFractal is offline MorbidFractal
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Quote:
Originally Posted by jan.didden View Post
MF, the I(B1) graph rises at frequency, is that not the LED input cap at work?

Jan
B1 is a behavioural current source whose output current is set to follow the current in V1. The load on V1 is set to increase current drawn and cancel the effects of diode, LED/Photo, capacitance.
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Old 22nd January 2018, 03:23 PM   #153
Mooly is offline Mooly  United Kingdom
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Op amp Linear power supply
And to think this all started with,

"I have a 741 and series pass transistor......"

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Old 22nd January 2018, 06:03 PM   #154
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by MorbidFractal View Post

Oh.. your new .asy looks like the old .asy but you might see from my circuits that I have being messing about with the .asy to get pretty circuits. Right click, open symbol, mess about and save.
Hmmm. How about this?
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Old 22nd January 2018, 06:06 PM   #155
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by MorbidFractal View Post
B1 is a behavioural current source whose output current is set to follow the current in V1. The load on V1 is set to increase current drawn and cancel the effects of diode, LED/Photo, capacitance.
Right. Got it.

Jan
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Old 22nd January 2018, 07:22 PM   #156
jan.didden is offline jan.didden  Europe
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Like so.
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Old 23rd January 2018, 11:00 AM   #157
jan.didden is offline jan.didden  Europe
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That '1MHz bump' originates (of course) in the input circuit, because that is the only place with feedback.
If you look at the open loop response between the input LED and the input photodiode, they show nice 1st order behaviour (fig 1). Yet if you connect them up in a loop it gets funny (fig 2).

I am seeing MvdG this weekend, see if he can make chocolate from it (which I am sure he can!).

Jan
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Old 27th January 2018, 12:57 AM   #158
Marksd is offline Marksd  United States
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All, I just added a new bench power supply today. I will experiment more, but have to stay to the basics. I find all of this interesting and could have never guessed in 63 years that power supplies are so complicated. The original circuit I started with was posted not he internet and thus started my path of experimentation and trying to understand the "why" it either worked or did not work. Thanks again.
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Old 27th January 2018, 09:44 AM   #159
vj_audio is offline vj_audio
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Originally Posted by dotneck335 View Post
I still challenge anyone to beat this supply for $10!!
LM317 / LM337 +/-1.5V~37V Adjustable Dual Voltage Regulator Power Board | eBay
This might for USD 6.53 - EA - Low Noise Dual Variable DC Regulated +/- 2.5V To +/-30V PSU EADPS02 – Eight Audio(R)
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