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Low
Voltage Latching Relay Driver
Using some small super capacitors, this circuit can latch and unlatch a mechanical
relay with 10 amp contacts, from a small 3 volt power source. By using a
latching relay, power can be controlled to a load with a tiny battery.
N-CH AND P-CH TRANSISTORS FORM PUSH-PULL DRIVER
This circuit can produce high speed output signals with fast rise and full times.
The unique change pumpaction allows the voltage of the
upper P-ch device to range from millivolts to hundreds of volts.....
Links to
electronic circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
LED driver combines high-speed, precision - 21-Aug-03 Issue of EDN
Applications such as turbidity measurement and densitometry require cleanly pulsed
light sources with stable amplitudes. The LED driver in Figure 1 illuminates retinal
neurons in a biological experiment that has similar requirements. For a given LED at a
given current, the intensity is stable, so switching a stable current is a simple and
effective way to obtain the needed function..... [Design Idea by Richard Cappels,
Mesa, AZ]
LED driver delivers constant luminosity - 12-Jun-03 Issue of EDN The
circuit in Figure 1 is similar in principle to that of a previous Design Idea
(Reference 1] but offers improved,reproducible performance. The output current is
almost constant over an input-voltage range of 1.2 to 1.5V and is insensitive to
variations of transistor gain. Transistors Q1 and Q2 form an astable flip-flop.....
[Design Idea by Israel Schleicher, Bakersfield, CA]
LED driver displays standing-wave ratio - 03/18/99 Issue of EDN The
circuit in Figure 1 uses an LM3914 LED driver to directly display standing-wave ratio
(SWR] in a low-cost, rugged instrument. The SWR-sensing head is derived from the ARRL
Antenna Handbookin an article that describes the tandem match. The forward voltage and
reflected voltage (VF+VR ] signal drives.....Page includes several designs.
Scroll to find this one..... [Design Idea by Richard Panosh, Vista, Bolingbrook, IL]
