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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.
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
µP Displays 10 Bit Data on Three LEDs - 11/07/96 EDN-Design
Ideas.....circuit in Figure 1 uses a PIC16C55 µP to read 10-bit binary
data and directly display data in decimal format on three
common-cathode LED displays. If value of data exceeds 999,
displays show three hyphens (---) to represent overflow. PIC16C55
has high drive..... [Design Idea by Yongping Xia, Philips Lighting
Electronics, Torrance, CA]
0.3-1.5V LED Flashlight - It's a little wisp of a circuit that
allows you to drive a blue or white LED from a low voltage. Normally, if
you want to light up a blue or white LED you need to provide it with 3,
3.5 V, like from a 3 V lithium coin cell. But a 1.5 V battery like a AA
cell simply will not work. But using the Joule Thief, it works like a
charm. Not only does it work with a brand new battery, but it works until
the battery is nearly dead-- down to 0.3 V. ....
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.
(added 12/04). …. [Designed by David A. Johnson]
