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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
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1 kV Power Supply produces a continuous arc - 02/05/04 EDN-Design Ideas:
Designing a high-voltage switching power supply that can produce a sustained arc
can be challenging. This compact and efficient design delivers 1 kV at 20W and can
withstand a continuous arcing, or short-circuit, condition.....(design idea added
1/05)
1.5A High Efficiency Synchronous Switching Regulator Evaluation Board -
evaluation board is designed to supply 3.3V at 15 mA up to 1.5A. input
voltage range is 4V to 14V. Components were selected based on design
procedure in LM2651 datasheet. PCB layout is critical to reduce noise and
ensure…. (app note added 3/05)
124 Volt AC Lamp Chaser using Solid State Relays - This circuit is similar to
LED clock using12 neon indicator lamps instead of LEDs. It operates from2 high
capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High
voltage (70 volts) for neon lamps is obtained from a small ...(added 4/02)
2 Cores Marry Make Swinging Choke - 05/11/95 EDN-Design Ideas: Designing an
output choke for a switch-mode power supply that must operate over large load
variations can be problematic. If you design the inductor for the maximum load the
power converter will see, the inductance will be below the critical inductance
required at light load. This inadequate inductance will cause the voltage on the
output capacitor to peak up, resulting in increased ripple on the
output....(design idea added 2/06)
2 Watt Switching Power Supply - In this small switching power supply, a
Schmitt trigger oscillator is used to drive a switching transistor that supplies
current to a small inductor. Energy is stored in the inductor while the transistor
is on, and released into the load circuit when the transistor switches off. The
output voltage is dependent on the load resistance and is limited by a zener diode
that stops the oscillator when the voltage reaches about 14 volts. Higher or lower
voltages can be obtained by adjusting the voltage divider that feeds the zener
diode. The efficiency is about 80% using a high Q inductor...(added 4/02)
8 Switcher Powers High Performance µPs - 04/13/95 EDN-Design Ideas: The
circuit in Fig 1 delivers 8A for driving as many as two of today's
high-performance, high-speed µPs. You can also optimize the design for lower
current by changing a few components. Most systems use a low-current 12V bias
supply and a poorly regulated high-current 5V to power the logic.....(design idea
added 3/03)
