SSR02 and SSR01 voltage

[a333bt]

Hi,
i have problem with SSR02 voltage.
Plan to use SSR01 and SSR02 to supply Hiraga amplifier with +-12V, 500mA bias.
With SSR01 i got 12V, but with SS02 i got only -8V instead -12V.

More data:
using AD797
input voltage from capacitor tank (55000uF) is +-14.6V
Voltage at AD797 pin2 is 3.17V at pin3 is 2.4V.

I removed preregulator LM337 to get more input voltage, because of 2.5V drop, but it came same output voltage 8V.

Could you help here?

Regards,
Bostjan

[peranders]

The problem is that the feedback voltage is higher than the reference.

Voltage at pin 6 and 7?

Do you use LM431? If yes, resistor values around that part?

[a333bt]

Hi,

voltage at pin6 is 1.2V; at pin7 is 0V

I use LM329

regards,
Bostjan

[peranders]

Pin 7 should be ground, correct but I ment the pin 4?

You have put tin drops on the solderside at J1 and J2?

[a333bt]

Hi,
pin4 is 8.11V.

About jumper J1 and J2 (senses), i dont get it what i must do. Do i have to make short with tin drop?

Bostjan

[peranders]

Yes, please read my text. Read the section about the sense function. Those input must always be connected. I have my doubts though feeding the AD797 from the output since the opamp must have at least 10 volts as supply voltage. If you put tin drops at the J1 and J2 and still won't get any function you can feed the opamp via R5 instead of R6.

[a333bt]

Hi,
i put tin drops on JP1 and JP2.

I measure some points, if helps:

AD797
pin2: -3.11V
pin3: -2.35V
pin4: -8.07V (also -14.6V tried)
pin6: -1.18V

Q2 D45H11
pin1: -1.89V
pin2: -14.6V
pin3: -8.17V

regards,
Bostjan

[peranders]

Is the Lm329 in the position with the thin outline? The thick outline is for LM431.

[peranders]

The voltage at Q2 seems not OK. Do you really have lower voltage at the base than the emitter?

[a333bt]

Base of Q2 is -8.78V; emiter -8.17V.

[peranders]

What about post #6? There you have base an another base voltage?

[a333bt]

Hi,

i measure again compare with SSR01:

SSR01:

* AD797:
pin2: 6.88V
pin3: 6.88V
pin7: 5.14V
pin6: 11.55V

* D44H11:
pin1: 12.55V
pin2: 13.25V
pin3: 11.94V

SSR02:

*AD797:
pin2: -2.97V
pin3: -2.04V
pin4: -1.18V
pin6: -7.95V

* D45H11:
pin1: -8.73V
pin2: -10.73V
pin3: -8.12V

Supply voltage : +-14.7V.

Measurements are with preregulator.

I tried measure without preregulator of SSR02, but same low voltage :|

[peranders]

You have 0.9 volts across the opamp inputs which means that the reference isn't working (high impedance) and the clamping diodes inside is active. 14.7 volts is too little for the the regulator but the problem isn't there. Try so solder in a 5.6V zener in parallel with LM329 if you don't want to remove it. Is the LM329 in the position according to my photos?

[peranders]

As long as the voltage at pin 2 is higher than pin3 you can never get it working. It must be the other way around at startup.

[a333bt]

yes, LM329 is in correct position.
pin1 is not connected, pin3 is grounded, pin2 has -0.8V.
But on SSR01 on pin2 is 6.98V.