|
Automatic Control Starts Loads Softly - 10/13/94 EDN-Design Ideas: [file contains
multiple circuits scroll to find this one].....(design idea added 3/03) |
|
AutoTransformer Regulator Inverts 12 Volt to Produce 12V - 08/01/97 EDN-Design
Ideas: -Produces Output of200 mA.....(design idea added 6/06) |
|
Circuit Automates Switch over between Battery & Source - 12/12/97 EDN-Design
Ideas: [file contains multiple circuits scroll to find this one].....(design idea
added 3/03) |
|
Circuit breaker handles Voltages to 32V - 05/25/00 EDN-Design Ideas: The
simplicity of low-side current monitoring can mask the advantages of a high-side
approach. You can monitor load currents in a power supply, a motor driver, or another
power circuit on either the high or the low side (ground). However, don't let the ease
of low-side monitoring cause you to overlook.....(design idea added 05/07) |
|
Circuit breaker provides overcurrent & precise overvoltage protection - 06/07/07
EDN-Design Ideas: A simple circuit breaker delivers precision overvoltage protection
and overcurrent protection.....(design idea added 07/07/07) |
|
Circuit Protects from Battery Polarity Reversal - This simple circuit can protect
a sensitive electronic circuit from an accidental connection of a battery with a
reversed polarity. The N-channel FET connects the electronic device to the
battery only when the polarity is correct. The circuit shown was designed for a
device powered from a single 1.5 volts button cell battery. However, the circuit
will operate with higher voltages as well. ….(designed by David A. Johnson) |
|
CMOS Gate Implements Reverse Phase Control - 05/21/98 EDN-Design Ideas: The
circuit in Figure 1 implements a "reverse" phase control, using only a single CMOS
4001 quad NOR gate. The circuit is known as a reverse phase control because, unlike
with common triac or SCR controls, conduction begins at the zero crossing of the ac
sine wave. Timing of the turn-off point .....(design idea added 2/06) |
|
Controller Provides Constant Power DC Load - 03/14/96 EDN-Design Ideas: [file
contains multiple circuits scroll to find this one].....(design idea added 3/03) |
|
Isolated Driver Forms Solid State Circuit Breaker - 03/03/98 EDN-Design Ideas:
[file contains multiple circuits scroll to find this one] -This circuit
allows standard TTL logic levels to safely drive a high-power dc load, circuit
provides also overcurrent circuit breaker functionality.....(design idea added
03/03/03) |
|
Load Switcher Draws only 6 µA - 07/04/96 EDN-Design Ideas: [file contains multiple
circuits scroll to find this one].....(design idea added 3/03) |
|
MicroController Watches Controls AC Power - 06/22/95 EDN-Design Ideas: [file
contains multiple circuits scroll to find this one] -circuit allows an
isolated microcontroller to both sense and control ac power to an externally
plugged-in device.....(design idea added 3/03) |
|
Novel circuit controls ac power - 01/07/99 EDN-Design Ideas: PDF contains multiple
circuits scroll to find this circuit.....(design idea added 09/05) |
|
Power source is insensitive to load Changes - 04/04/02 EDN-Design Ideas: For the
heating and cooling elements common in industrial systems, resistance is not a fixed
quantity. These elements include such devices as positive-temperature-coefficient
heaters and thermoelectric coolers. Their resistance can change more than 100% during
operation, and the result.. (added 1/05) |
|
Short DC Power line pulses afford remote Control - 10/25/01 EDN-Design Ideas: If
you face the challenge of adding a second, independently controlled light source to an
existing ceiling lamp controlled by a wall switch, you may find that stringing a
second power line is impossible. First, you can replace the wall switch by the circuit
in Figure 1. Pushing the on switch.... (added 1/05) |
|
Smart Switch Cuts Transformer turnon Current - 04/23/98 EDN-Design Ideas: [Note:
File contains multiple circuits scroll to find this circuit.] Piezoelectric
buzzers, such as the Murata (Smyrna, GA)PKB5-3A in Figure 1, make excellent alarms.
They're compact, lightweight, efficient, and reliable. However, a piezo alarmr.....(design
idea added 11/05) |
|
Soft Start Circuit for Power Amps - Designed for (large) toroidal transformers,
limit the inrush current to a sensible value. (electronic schematic / circuit
added 4/02) |
|
Soft start Controller is gentle on loads - 11/22/01 EDN-Design Ideas: The control
circuit in Figure 1 senses a given load and automatically soft-starts the load by
synchronously adjusting the power to that load. You can also manually adjust the power
delivered to the load by controling the phase angle of the line voltage across the
load. The phase-angle adjustment for every ac half cycle covers0 to 180.....(design
idea added 10/03) |
|
Solid State Relay Requires only 50uA Drive Current - This circuit demands a
control current that is 100 times smaller than that needed by a typical optically
isolated solid state relays. It is ideal for battery powered systems. Using a
combination of a high current triac and a very sensitive low current SCR, the circuit
can control about 600 watts of power to load while providing full isolation and
transient protection. Published in Electronic Design, Dec 2, 1996. ….(designed by
David A. Johnson) |
