The ICL8038 waveform generator is a monolithic integrated circuit capable of producing high accuracy sine, square, triangular, sawtooth and pulse waveforms with a minimum of external components. The frequency (or repetition rate) can be selected externally from 0.001Hz to more than 300kHz using either resistors or capacitors, and frequency modulation and sweeping can be accomplished with an external voltage…. The chip is available in some stores, not in production. (This is another chip of intersil i used for many things – delabs)
ICL8038 Device Information
- Low Frequency Drift with Temperature 250ppm/oC
- Low Distortion 1%(SineWave Output)
- High Linearity 0.1%(Triangle Wave Output)
- Wide Frequency Range 0.001Hz to 300kHz
- Variable Duty Cycle 2%to 98%
- High Level Outputs TTL to 28V
- Simultaneous Sine, Square, and Triangle Wave Outputs
- Easy to Use – Just a Handful of External Components Required
Everything You Always Wanted to Know About the ICL8038
Use in Phase Locked Loops – Its high frequency stability makes the ICL8038 an ideal building block for a phase locked loop as shown in Figure 9. In this application the remaining functional blocks, the phase detector and the amplifier, can be formed by a number of available ICs (e.g., MC4344, NE562).
The linearity of input sweep voltage versus output frequency can be significantly improved by using an op amp as shown in Figure 10.
Open Circuits is a wiki for sharing open source electronics knowledge, schematics, board layouts, ports and parts libraries. This include open hardware Music Players, atomic microscopes, PC, PDA and mobile phones, and batteries. Please help us to build this resource by submitting your component descriptions, projects, techniques, and PCB footprints.
Open Circuits – Open Source Electronics
Some Projects that look Interesting are
- Multi-purpose Embedded System
- dsPIC33 Development Board
- ADuC832 Development Board
- N8VEM Home Brew Computing Project
The Open Source Movement, typically covers Open Hardware, Open Firmware, and Open Software. The Open Firmware movement provides firmware which you may also know as soft-IP or FPGA coding see Open Cores for more details.
Excellent examples of Open Hardware projects range from projects at OpenCircuits to Tiny Embedded Ethernet Devices and Advanced & Intelligent Camera Designs which provide solid-state camera and FPGA assisted hardware designs. A solid overview of projects can also be found at Open Innovation Projects.
The OpenEEG project is about making plans and software for do-it-yourself EEG devices available for free (as in GPL). It is aimed toward amateurs who would like to experiment with EEG.
OpenEEG hardware – Amplifiers
I found the amplifier designs extremely good as a learning material.
Amplifier schematic [55kb] (aka analogue board; contains two amplifiers) and digital board schematic [48kb] as images.
These are high tech jigs, fixtures and instrumentation/automation gizmos that bill built. Electrical gizmo builder for the UNLV Physics Dept.
Bill O’Donnell – Tech Gizmo Builder
These projects are advanced and not for a beginner student or newbie hobbyists. These pages are knowledgable and will help students and DIY enthusiasts understand more about Lasers, Precision Temperature Control and stepper motors among other things.
Auto Fill Circuit for Laser Cooling Loop – Ethernet Data Logging
Here is an automation solution with a ethernet usage. The code and diagrams are also there. This is something that covers many aspects of engineering in one project. Try such things out to learn, only after you have mastered the basics.
“The Ethernet connection is based on an XPORT form Lantronics. Basically it lets you use a serial port to send things over Ethernet. A PIC microcontroller with an A/D converter digitizes the pressure, the pressure set point, the high and low pressure alarm points and the supply voltage (since everything is ratio-metric). “