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The cheapest dual trace scope in the galaxy
This submini USB scope is based on a Atmel Tiny45 cpu and cost less than 5€ with a homemade pcb It has 2 analog inputs and can supply 5V ont the 4 pins header on the right. One of the inputs can be scaled down with the trim pot. The firmware in the Tiny45 is written in C and compiled with Winavr and usb source code from obdev. As you can see, there is no crystal , the software sync the internal 16.5Mhz pll clock with the USB clock. The cost with a home made pcb is around 5€.How to Design a Square or Triangle Wave Oscillator from a 555-Timer Integrated Circuit
Target Audience This is intended for anyone who wants to simply and cheaply make a generator for a square, triangle or blended waveform that can be frequency and amplitude adjustable. I expect that this audience is primarily constituted of audio enthusiast who want a base for a synth and beginner electronic hobbyist who want a clock pulse for a digital chip or clock. Difficulty Level If you have no experience with circuits, this will be challenging, and hopefully a learning experience. If the schematic below looks simple, this will be easy.
Current and Voltage meter
FIRSTLY A WARNING. Any system with 200V at 30A is unquestionably LETHAL. I once got to observe what 220VAC @ (probably) 50-100A could do; I was getting gas one morning at a local Circle K, and next door a "technician" was working on an HVAC unit on top of a burger joint. Well, he didn't follow proper lockout/tagout procedures (or hell, just remove the main fuses or drop the breaker, or - any number of things that you would think someone with "experience" would know to do), and somehow created a short. Very loud buzzing whoosh noise that lasted a couple of seconds with all I can describe as an "electrical jet flame" (corona discharge?)shooting out about 3 feet.
ICL7107 / ICL7106 - Digital Voltmeter
200m 4-Channel 433MHz Wireless RF Remote Control Having the ability to control various appliances inside or outside of your house wirelessly is a huge convenience, and can make your life much easier and fun. RF remote control provides long range of up to 200m / 650ft and can find many uses for controlling different devices, and it works even through the walls. You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of. <p style="text-align:right;color:#A8A8A8"></p>
front side Copyright of this circuit belongs to smart kit electronics. In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic. General Description This is an easy to build, but nevertheless very accurate and useful digital voltmeter.
Led display digital Voltmeter - circuit diagrams, schematics, electronic projects
Darin (ForkenSwift) is famous for converting a car from ICE to all electric, using a fork lift truck motor... Most of us in the home built EV world have seen his site and read his story. I'm in a similar situation and just starting down the road of trying to build a battery monitoring system for my conversion, a pontiac firefly with 11 12v batteries in series. I need to read the voltage of each, one after the other several times a second, and also sum the total battery pack V after each pass.