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...