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DC to DC Power Supplies Converter Circuits
Designed by David A. Johnson, P.E.
Last Updated on:
Tuesday, October 13, 2009 01:26 PM
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Dave's Circuits: Frequency to Voltage Period to Voltage
Sine to Square Wave Voltage Converters Voltage to Frequency DC
to DC Power Supplies High Voltage Power Supplies
Switchmode Power Supplies Voltage Controlled Oscillators |
- 0.5V Negative Supply
Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps. It is ideal for supplying a negative rail to low power “rail to rail” op amp
circuits, which need to have a true zero volts output.
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- Battery Powered Plus-Minus 15v Supply
Many classic operational amplifier circuits call for a split positive and negative 15 volt supply. The circuit below makes the job of generating such a supply much easier by
using an off-the-shelf DC to DC converter, powered from a cheap 6v battery made from four AA cells. The converter, part number VESD1-S5-D15-SIP, is available from Digikey, their catalog number 102-1410, for about $6.00. To insure clean
voltages, I follow the output of the converter with two voltage regulators, also available from Digikey. The result is a very nice supply rated at 30ma from each supply voltage. This should be plenty of current for most circuits.
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Run Switching Type AC Power Adapters on DC NEW
I have received a couple emails from people looking for inexpensive DC to DC converters, which can convert 40v to 60v DC into say +5 or +12v. Such input voltages are often found in new automotive and industrial applications with a typical DC
voltage of 48 volts. It turns out that many, not all, but many, standard AC line operated power adapters, which use switch mode techniques, will indeed work great when supplied with DC instead of AC. The unit below works down to about 30v DC and
delivers 500ma at 5v. If you draw less current, it will operate at even lower DC input voltages....
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More Converter Circuits
More DC to DC Circuits
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