DiscoverCircuits.com, has 30,000+ 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 or post your
design.
The contents & graphics
of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB
SITE server
AUDIO
FREQUENCY DIGITAL NOISE GENERATOR
When you need to test an audio circuit with broadband noise, this circuit
works great. It uses just three inexpensive C-MOS ICs that generate a series
of output pulses whose widths vary randomly. I included a level control pot.
C-MOS
INVERTER MAKES LOW POWER AMP
With the addition of one resistor and a capacitor, some common logic ICs can
be transformed from digital to analog duties. This circuit outlines some
the features to expect from different inverter ICs.
CIRCUIT FORMS
DIVIDE BY 1.5 COUNTER
Two inexpensive ICs divide a TTL clock signal by 1.5. By following the circuit with
another flip/flop, you could also generate a divide by three function.
Logic Controlled 12v DC
Motor with Automatic Brake
There are times when you would like to control a DC motor using a simple +5v logic swing
signal. The circuit below performs this feat and also includes an automatic motor
braking circuit. When the input logic signal swings from 0v to +5v, the n-channel
MOSFET Q2 turns on, which turns on the p-channel MOSFET Q1. Current flows into the
motor through the schottky diode D2. When the control logic swings back 0v, Q1 turns
off. This activates the braking action of Q4, which applies a short across the motor.
The sudden stop is often desired in some motor controlled systems.
