Hi there!
I am building an xono and I finished the power supply's. I made them hardwired. I can't get more out of them than a maximum of between 23,4V and 24,6. And for what I read it has to be +/- 30V. Where do I get the other 6 V. Its a regulated supply with lm317/337. The capacitance is 4 x 15000 uF each supply. I am using a schuro shielded trafo 64VA with 2 x 30V secundair. Should I change the resisting value with a lower pot, say 1K? They are now 5K. thanks allready for the answer. Have a nice weekend, Teake
I am building an xono and I finished the power supply's. I made them hardwired. I can't get more out of them than a maximum of between 23,4V and 24,6. And for what I read it has to be +/- 30V. Where do I get the other 6 V. Its a regulated supply with lm317/337. The capacitance is 4 x 15000 uF each supply. I am using a schuro shielded trafo 64VA with 2 x 30V secundair. Should I change the resisting value with a lower pot, say 1K? They are now 5K. thanks allready for the answer. Have a nice weekend, Teake
Hi Teake,
With the information you've given it's hard to tell. What is you're psu configuration? Is it crc, clc, or something else?
Assuming that you're not drawing excess current somewhere and the voltage off the rectifier is somewhere near +/- 42 V (1,4*30), you're losing a total of 18 V per rail. What is the voltage potential across the 317/337's? What is the voltage of the psu without the xono circuit attached (use a dummyload of something like 2k/3W)
If you could post a schematic with component values and voltage measurements, you might get more answers.
regards,
Joris
With the information you've given it's hard to tell. What is you're psu configuration? Is it crc, clc, or something else?
Assuming that you're not drawing excess current somewhere and the voltage off the rectifier is somewhere near +/- 42 V (1,4*30), you're losing a total of 18 V per rail. What is the voltage potential across the 317/337's? What is the voltage of the psu without the xono circuit attached (use a dummyload of something like 2k/3W)
If you could post a schematic with component values and voltage measurements, you might get more answers.
regards,
Joris
Hi teake,
Ok, the voltage after the rectifier is good. In the schematic you've posted i notice different values for capacitance from what you posted first (4*15mf). Are the values in the schematic the same as actually used? What is the value of the resistors r5/r6 you've actually used?
Could you give a voltage reading from the input of the regulators (317/337) to ground?
regards,
Joris
Ok, the voltage after the rectifier is good. In the schematic you've posted i notice different values for capacitance from what you posted first (4*15mf). Are the values in the schematic the same as actually used? What is the value of the resistors r5/r6 you've actually used?
Could you give a voltage reading from the input of the regulators (317/337) to ground?
regards,
Joris
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