simple circuit reverse engineering

A7p - on the bottom of the page

http://radioskot.ru/forum/9-449-27

Thanks Ted! so it IS a diode! :slight_smile:

single
http://etronics.free.fr/dossiers/analog/analog10/images/image28.gif

Thanks Ted, that really helps

More problems ?

Oh yes! lol
still dont know what the red/white wire is for, for instance.
in the simulator i put a generic op amp (the only choice I have) but the AD706 in my circuit is a DUAL op amp so I guess it must be powered with a dual voltage.... and not as I did

dual = 2 op amp in one package

opps, sorry I meant BIPOLAR
http://www.analog.com/media/en/technical-documentation/data-sheets/AD706.pdf

Op amp can work in two modes or single mode of power supply.
google - dual supply op amp circuit and single supply

here is the schematics i was able to make

post # 1 top drawing, which wire is red and which white ?

from top to bottom:

left side:

yellow
white/red
green
red

on the right side:
black

I sent you a PM Ted :slight_smile:

From top
IN - to control laser beam
OUT - signal from photodiode

  • voltage supply
  • voltage supply
    Black
    control bias op amp
    The circuit is using only one op amp.
    Double check your drawing - op amp is in strange configuration

google - ir thermometer circuit

https://www.google.ca/search?q=ir+thermometer+circuit&rlz=1C1NCHB_en&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiPxdD5zpLbAhVJ_IMKHfJDAd8Q_AUICigB&biw=1440&bih=784

great! but red wire is going straight into pin8 (v+) of the ic?? and green into pin1 (v-)... is there something i dont get? obviously there is :frowning:

For double op amp is almost standard - pin #4 is ground or minus and #8 is +, the easiest way to find out where you connect the battery

ted:
Double check your drawing - op amp is in strange configuration

I did not notice that the op amp is upside down.

Correction
IN - to control laser beam
IN - photodiode modulation signal
Signal Out - from photodiode
Red + voltage supply
Black - voltage supply