In the world of electronics, it's all too easy to generate heat.
Once in a while though we need to cool and that's where
thermoelectric coolers, TEC's, or Peltier coolers come in.
This circuit controls the temperature of a small mass with a
Bang Bang Heater
One application of a pulse width modulator is to drive a
resistive load with a saturated switch. The power dissipated by the
resistor (up to 5 watts) is converted to heat which raises the
temperature of the object that the resist...
This circuit will allow you to operate small devices like laptop
computers inside your automobile without an expensive automobile
power supply. The circuit takes advantage of the fact that power
transformers are linear devices and can be used to ...
Touch Activated Switch and Doorknob Alarm
Here are two circuits from Discover
Circuits - a site created by David Johnson, P.E. I urge you to
visit his site and check out his library! The italicized text has
been reproduced from his site.
This design was generated as part of a remote weather station
project. One of the requirements of the design is that it have a
solar-powered supply with rechargeable batteries. This design is
based on a photovoltaic array available from Radio Sha...
By merging a digital potentiometer with an oscillator chip, we
can make a very small programmable oscillator (1 uMAX and 1 SOT23
package). Not only does this circuit take up very little board
space but it can be controlled with only three signals...
Here's a two part project for an RF Spectrum Analyzer from QST
Magazine. Even if you don't build the project there's some great
information in here regarding RF filters, mixers, oscillators and
RF Spectrum Analyzer - Part 1
RF Spectrum Ana...
AM/FM/SW Active Antenna
This circuit shows an active antenna that can be used for AM,
FM, and shortwave (SW). On the shortwave band this active antenna
is comparable to a 20 to 30 foot wire antenna. This circuit is
designed to be used on receiver...
Using an 8-pin PSoC to Produce 100Khz Pseudo Random White Noise with a Six Hour Period
By using the programmable blocks of a Cypress MicroSystems CY8C25122 PSoC microprocessor, it is possible to construct a 100Khz bandwidth white noise g...
Here's a little circuit that simplifies interfacing to bipolar
stepper motors. It's similar to a common unipolar design available
on the internet. However, I modified it to use a pair of
MOSFET-based H-bridges. In addition, I added an enable sign...