cyw1984 Posted September 28, 2005 Report Share Posted September 28, 2005 +/-15V power supply using LM317 and LM337 regulator ICsHow to designa +/-15V power supply using LM317 and LM337 regulator ICs. Thx The voltage is used to DAC (AD669) I have try to design the circuit.... Is it Right?? [img width=680 height=453] Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 28, 2005 Report Share Posted September 28, 2005 Hi Cyw,Your circuit is correct for a dual-polarity supply having adjustable output voltages from 1.25V to about 27V.You don't need an input voltage as high as 30V when anything more than 18V will be fine.You don't need pots to adjust the output voltages when 2.7k (5%) resistors are fine to produce 15.3V outputs. ;D Quote Link to comment Share on other sites More sharing options...
cyw1984 Posted September 28, 2005 Author Report Share Posted September 28, 2005 Hi Cyw,Your circuit is correct for a dual-polarity supply having adjustable output voltages from 1.25V to about 27V.You don't need an input voltage as high as 30V when anything more than 18V will be fine.You don't need pots to adjust the output voltages when 2.7k (5%) resistors are fine to produce 15.3V outputs. ;DThanks a lot~~I need pots to adjust the output voltagebecause it is use for V reference .....My AD669 DAC Vref is given by this +-10V Quote Link to comment Share on other sites More sharing options...
Guest Alun Posted September 28, 2005 Report Share Posted September 28, 2005 Can't you just use a 2.4K resistor with a 500R trimmer in series? Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 28, 2005 Report Share Posted September 28, 2005 I need pots to adjust the output voltagebecause it is use for Quote Link to comment Share on other sites More sharing options...
moutoulos Posted September 28, 2005 Report Share Posted September 28, 2005 :) Quote Link to comment Share on other sites More sharing options...
cyw1984 Posted September 29, 2005 Author Report Share Posted September 29, 2005 Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 29, 2005 Report Share Posted September 29, 2005 +- 15V is provide thw power of AD669 (VCC,CEE)Then since the supply range of the IC is very wide, you don't need the pots, just 2.7k resistors instead for +-15.3V. Quote Link to comment Share on other sites More sharing options...
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