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
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
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
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
cloxart:
The reason I need to use that particular sensor is that I have 5 of them available, taken from old welding machines and doing that exact job of sensing the welding temperature.
How were they integrated into the old welding machines?
Tom..
@Ted: you say black = -V, but black is going into OUT1??
@ TomGeorge: I have no way to check, they were originally mounted on some induction welding machines (CEIA LOGE 23) but the machines has gone and the manufacturer that I contacted said they do not have any documentations as it is a very old model.
thanks Ted,
I guess I should start testing it... do you think I am correct in assuming that on the laser beam wire I must connect a current limited supply?
All LEDs required current limit, the simplest is a resistor - 200 -300 ohm .
That is 3V laser diode.
LED wire (brown ) - required modulation signal,
google - chopper amplifier