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Circuits designed by David Johnson, P.E.
Last Updated on:
Thursday, March 22, 2012 07:51 AM
Master Category List
- Dave's Circuits
Text & Graphics
Copyright © David A. Johnson, PE - ALL Rights Reserved.
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Rectifier
Circuits |
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Circuit
Forms Ideal Diode Function
This circuit uses a low power op amp and a p-channel FET to form a diode
function with a very low 0.05 volt voltage drop. With the selected FET,
the circuit can handle up to 2 amps of current. Higher currents are
possible with a FET with a lower channel resistance. The total current drawn
by the circuit during operation is a low 20 microamps. The maximum
voltage is 15v.
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Full Wave Rectifier
Using a LF412 high speed dual op amp, this circuit will rectify any signal up to
about 100KHz with a minimum amplitude of about 50mv peak to peak.
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Full Wave Rectifier-Precision
Using a LF412 high speed dual op amp, this circuit will rectify any signal up to
about 100KHz with a minimum amplitude of about 50mv peak to peak.
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Ideal
Blocking Diode Circuit for Photovoltaic Solar Panels
Most photovoltaic solar panels are used to charge a battery during the daytime.
Nearly all panels come equipped with a blocking diode. The diode prevents DC
current from flowing backwards from the battery bank into the panel at night.
The usual blocking device of choice is a schottky diode with a typical 0.5v voltage
drop. In some large panels, which can often source over 4 amps of current, the
power loses due to this voltage drop can add up. As an example a 4KW solar
power system.
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Precision Fullwave Rectifier
I have used this handy circuit many times. It accurately converts an AC signal
into pulsing DC, which can be filtered to provide an average of the input voltage.
It works from millivolts to volts. The circuit shown requires a stable +5v
reference if a single power supply is used.
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