DiscoverCircuits.com, has 28,000+ electronic
circuits, cross-referenced
into 500+ categories. We have searched the web to help you
find quick design ideas.
We make every effort to link to material posted by the designer.
Please let us if you would like us to link to your design.
CHARGE
COUPLED BI-DIRECTIONAL POWER MOSFET RELAY
The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to
drive two power MOS transistors from a 12v to 15v supply. Since the coupling
capacitor values used to drive the FETs are small, the leakage current from the
power line into the control circuit is a tiny 4uA. Only about 1.5mA of DC is needed
to turn on and off 400 watts of AC or DC power to a load.
Charge
Coupled MOSFET Relay This circuit acts as an AC/DC relay with a rating up to 50 volts peak and up to
10 amps of current. The differential oscillator supplies voltage to the gates
of the two FETs with good isolation will drawing only 1.5ma of current.
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.
FET INPUT
HIGH SPEED LIGHT DETECTOR
This circuit is yet another design that converts current from a PIN photo diode to a
voltage. It has a bandwidth that extends beyond 50MHz.
FINGER
TOUCH ACTIVATED SWITCH
It does not get any easier if you want a solid-state switch that is activated by the
touch of a finger. Two small metal pins route voltage through the finger skin to a
MOSFET switch. The circuit is great for situations where a membrane type mechanical
switch is not desired.
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
Circuit Detects Current Pulses: 01/06/94 EDN-Design Ideas / (Electronic
Circuit diagram added 03/03) The pulse detector provides a visible indication of
positive and negative current pulses. The pulses amplitudes can vary from20 to150 mA.
The pulses durations can range from10 to40 msec, and their repetition rate can span40
to180 pulses/minute.
Defining Diode Data Sheet Parameters: This application note will take the
reader on a tour of parameters used by Advanced Power Technology in their diode data
sheets. In most cases the intent will be to define and explain. In a few cases more
discussion will be provided to clarify the usage of data sheet information. The note
will be divided into sections corresponding to the sections of the data sheets.
Application Note Microsemi APT0301 (app note added 4/08)
