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Boosting Regulator Current - Although 78xx series of voltage regulators are
available with different current outputs, you can boost available current output
with this circuit. A power transistor is used to supply extra current to load
regulator, maintaining a constant voltage. Currents up to 650mA will flow
through regulator, above this value and power transistor will start to
conduct, supplying.... (added 10/05) |
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Bootstrapped boost converter operates at 18V - 04/23/98 EDN-Design Ideas:
[Note: File contains multiple circuits scroll to find this circuit.] Many
circuits, such as those that use batteries or solar cells, must operate in face
of decreasing supply voltages. The circuit in Figure 1 maintains maximum load
current as supply voltage drops. The regulator boosts.....(design idea added
11/05) |
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Buck regulator and two inductors make dual Polarity converter - 03/20/03 EDN-Design
Ideas: A common problem for power-supply designers is to create a compact,
dual-polarity step-down converter. If space and cost are not concerns, the obvious
solution is a pair of dc/dc converters, one for each output.....(design idea added
1/05) |
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Buck regulator controls white LED with optical feedback - (Video Design Ideas- EDN,
10/25/07) -- By using optical feedback, you can stabilize the output level of a
high-intensity LED. (electronic design idea added 9/08) |
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Buck regulator forms high Power inverting –5V supply - 04/01/04 EDN-Design Ideas:
Configuring a step-down switching-converter IC as an inverter yields an efficient,
high-power, -5V supply that can of deliver currents as high as 4.5A at the 12V input
or 3.2A at the 5V input (Figure 1). Convent.....(design idea added 1/05) |
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Build your own laboratory precision voltage reference - (Video Design Ideas- EDN,
05/24/07) -- Mark Thoren, mixed-signal application engineering manager with Linear
Technology, demonstrates an amplifier-based circuit design for a relatively
inexpensive precision voltage source. (electronic design idea added 9/08) |
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Capacitance Multiplier Power Supply for Class-A Amplifiers - Extremely low ripple
supply with less power dissipation than a regulator (electronic schematic / circuit
added 4/02) |
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Car Battery Charger (Aaron Cake) - quickly and easily charge most any lead acid
battery, automatically turns charging off when ready (added 04/03/02) |
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Car Converter for 12 Volt to 9V - (Tony van Roon's circuit / schematic added 3/03) |
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Car NiCd Charger - This circuit provides up to20-Volt output from a regular13.2V
automotive battery, to enable constant current charging of NiCd battery packs up to15
cells @1.2V (Tony van Roon's 18V total). (Tony van Roon's electronic design added
5/02) |
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Ceramic output capacitors enhance internally compensated switchers - 07/20/06 EDN-Design
Ideas: Restore switching regulator stability when you change output-capacitor
compositions.....(design idea added 10/06) |
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Change Improves Regulators’ Reliability - 05/12/94 EDN-Design Ideas: The
standard circuit for adjustable, 3-terminal regulators (LM317, LM350, etc)in Fig 1a
suffers from a designed-in fault: If potentiometer R2’s wiper loses contact,
regulator’s output goes high. Because potentiometer is most unreliable
part in circuit, consider using circuit in Fig 1b. Now,.....(design idea
added 3/03) |
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Cheap pushbutton replaces rotary switch - 10/26/00 EDN-Design Ideas: / PDF
contains multiple circuits, scroll to find this circuit.....(design idea added 6/03) |
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Circuit improves on Bias for GaAs FETs - 12/06/01 EDN-Design Ideas: It's
important to properly sequence the bias applied to an RF/microwave GaAs FET or a MMIC
(monolithic-microwave-IC)amplifier. These devices are extremely sensitive to drain and
gate voltage levels as well as to the order in which these biases turn on and off. A
GaAs-FET amplifier that uses two bias voltages.....(design idea added 1/05) |
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Circuit provides ADSL frequency reference - 05/25/00 EDN-Design Ideas:.....(design
idea added 2/06) |
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Circuit provides leading edge Blanking - 05/29/03 EDN-Design Ideas: In
isolated switch-mode power supplies using peak-current-mode control, generally the
current-sense resistor senses the current on the primary side of the power converter.
Figure 1 shows a typical circuit, in which R2 is the current-sense resistor that
monitors the current. The current-sense signal goes to the..... (adden 02/05) |
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Circuit Provides Reference for Multiple ADCs - 01/24/02 EDN-Design Ideas:
The achievable accuracy for systems with multiple ADCs depends directly on the
reference voltages applied to the ADCs. Medical-ultrasound-imaging systems, for
example, commonly include a large number of ADCs in the system's beam-former
electronics, with the ADCs usually organized in groups of 16, 24, 32, and so
on.....(design idea added 1/05) |
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Compact Step-Up Converter Conserves Battery Power - DN358 Design Notes
(Linear Technology) (app note added 2/06) |
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Constant Current Battery Charger - A simple method of charging a battery from a
higher voltage battery is shown in the circuit below to the left. Only one resistor is
needed to set the desired charging current and is calculated by dividing the
difference in battery voltages by the charge current. So, for example if 4 high
capacity (4000 mA hour) ni-cads are to be charged at 300 mA from a 12 volt battery,
the resistor need,....(circuit added 7/02) |
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Create a Virtual Ground with the LT1118-2.5 Sink/Source Voltage Regulator - DN115
Design Notes (Linear Technology) (app note added 2/06) |
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Current sensing scheme improves PFC on/off sequences - 06/27/02 EDN-Design Ideas:
PFC (power-factor-correction)preconverters typically use the step-up, or boost,
configuration, because this type of converter is relatively easy to implement (Figure
1). However, this topology requires the output voltage to be higher than the input
voltage. When this condition is not the case—for example,.....(design idea added 1/05) |
