I mean the 23 volt supply.

 

2 amp load 4.39v, 4 amp load 4.35v

Both units (Altai and this one) have a very similar transfor with two windings, one outputting only 6v ac (Altai has a higher Amp output), the Altai seems to use this lower voltage to power the op amp with looks to me half wave rectification.

 

I mean the 23 volt supply.

Yes the transformer ac voltage does drop 2 volts on 4 amp load, but so does the Altai?

 

Yes the transformer ac voltage does drop 2 volts on 4 amp load, but so does the Altai?

I at present am not using this lower second winding

 

I at present am not using this lower second winding

I tried using it a few days ago, rectified it full wave and used it to power my op amp circuit at @9v, my max output I think was 7v

 

I tried using it a few days ago, rectified it full wave and used it to power my op amp circuit at @9v, my max output I think was 7v

meant to say the collector of both power transistors were connected to the larger 23v, I have something wrong

 

How much does the 23 volt dc voltage drop under load

 

How much does the 23 volt dc voltage drop under load

2v

 

If you remove Q1 and the voltage divider at pin 3 the output will require less gain to achieve 12 volts.

 

2v

Audioguru stated the 23v single rail powering the op amp was too high, I agree with him.
The 23v is withing tolerance for the chip but when I power it at a lower voltage I get a very limited voltage output

 

I couldn't find any data on the op amp do you have a link?

 

I couldn't find any data on the op amp do you have a link?

I just unsoldered resistors, unfortunately got the same result as before, with Q1 also removed, look for datasheet now

 

I just unsoldered resistors, unfortunately got the same result as before, with Q1 also removed, look for datasheet now

https://www.ti.com/lit/ds/symlink/t...-digikeymode-dsf-pf-null-wwe&ts=1608509796457

 

OK, if same results then you don't need those components.
Try reducing the 10K resistor on the shunt.

 

OK, if same results then you don't need those components.
Try reducing the 10K resistor on the shunt.

to what 6k?

 

I said the 2N2222 transistor should be removed and the minimum supply voltage should be +18.3V for the output to be 14.8V at 4A.
The voltage losses when the output current is high are in the 100 ohms resistor, the base-emitter voltage of the TIP41. the base-emitter voltage of the output transistors, the 0.1 ohm emitter resistors and the wiring.

The maximum output of the TLE2141 opamp is 1.3V less than its supply voltage so the voltage losses are 18.3V - 1.3V -14.8V= 2.2V. If the opamp had infinite voltage gain then the output voltage would not drop when the load current is high but the minimum voltage gain of a TLE2141 is only (!) 100,000 divided by the voltage gain of 5 times you want so it can reduce the voltage loss by about 20,000 times to 0.1mV. The wiring makes a much larger voltage drop.

 

Try 4.7K

 

I said the 2N2222 transistor should be removed and the minimum supply voltage should be +18.3V for the output to be 14.8V at 4A.
The voltage losses when the output current is high are in the 100 ohms resistor, the base-emitter voltage of the TIP41. the base-emitter voltage of the output transistors, the 0.1 ohm emitter resistors and the wiring.

The maximum output of the TLE2141 opamp is 1.3V less than its supply voltage so the voltage losses are 18.3V - 1.3V -14.8V= 2.2V. If the opamp had infinite voltage gain then the output voltage would not drop when the load current is high but the minimum voltage gain of a TLE2141 is only (!) 100,000 divided by the voltage gain of 5 times you want so it can reduce the voltage loss by about 20,000 times to 0.1mV. The wiring makes a much larger voltage drop.

Hello again, Can I use a zener to lower the voltage to 18.3v supply for the op amp?

 

Hello again, Can I use a zener to lower the voltage to 18.3v supply for the op amp?

There is a slight improvement even now on the 4amp draw at 12v output....earlier the 12v dropped to 11.89v...........now 11.92v

 

You don't need to drop the voltage. Did you reduce the 10K?