Logic Circuit

The circuit in Figure 1 exploits the inherent nonlinearity of a Mini-Circuits (Brooklyn, NY) MAR6 microwave amplifier to configure a low-level mixer. The idea is to add the input signals and feed the sum to the MMIC (Figure 1a). The amplifier`s saturation characteristic produces the harmonics and intermodulation products...

This project is designed to program the 8-pin PIC12c508A and 18pin PIC16F84 microcontroller chips to support the projects we have designed, however it will also program a number of other 8-pin & 18-pin microcontrollers and the full list can be seen when using IC-Prog...

Finally I got the problem with the limited resource of 8-bit microprocessor. One of my experiment needs the computing power between 8-bit and 32-bit cpu. For 8-bit applications I used MCS51 and AVR. Whereas the 32-bit applications, I used embbeded PC running linux. So I chose the cheap 32-bit cpu from Motorola, the 68HC000. The chip is quite old but there are many chip makers still produce it...

After reading the Mobile Robots Book, written by Joseph L. Jones and Anita M. Flynn, and get the Interactive-C file from ftp://cher.media.mit.edu, I found a very nice S19 downloader written by Randy Sargent. I started to download the pcode to my HC-11 board, and run Interactive C. No problem with my board, it works very nice...

Many embedded-microcontroller applications require generation of analog signals. An integrated or stand-alone DAC fills the role. However, you can often use PWM signals for generating the required analog signals. You can use PWM signals to create both dc and ac analog signals. This Design Idea shows how to use a PWM timer to simultaneously create a sinusoid, a ramp, and a dc voltage...

Building a stable noise generator for audio-frequency purposes requires only a few components. The circuit in Figure 1 relies on linear-feedback shift registers and some simple software. An eight-pin Microchip (www.microchip.com) PIC12C508 controller (IC2) with a short program generates pseudorandom noise at its output pin, GP0. A single controller is sufficient for simple applications...

By combining the responses of an Analog Devices (www.analog.com) AD590 temperature sensor and a Humirel (www.humirel.com) HS1101 humidity sensor, you can generate a single TTL-level signal containing information from both sensors (Figure 1). This design uses a 74HC123 monostable multivibrator, IC1, to form a free-running oscillator...