This is a Digital Panel Meter based on ICL7107. This was the workhorse Digital Readout chip before Low power uC designs were developed. Even now it is the easiest way an analog parameter can be displayed in an instrument. This is the Display Circuit and PCB part of of section Temperature Control. The above circuit [...]
Archive of posts filed under the Hobby Lab category.
MakerSpace Hackerspace and TinkerSpace
I am using the word MakerSpace for the same Hackerspace for just one reason, many conservative regions in the world are spooked silly when you say the word hacker. I shall use this word Maker so that youngsters and students are not barred from MakerSpace from these regions. Finally i would like to say that [...]
Measureall Workbench Test Instrument
This was a Student Project of mine, it is a very basic instruments that could do most of the tasks on a test bench. The cabinet used, was available as a part of a Hi-Fi DIY System, The Range and Mode switches were Modular Stackable Interlocked MultiPole Switches. The rest of the Interface were wirewound [...]
Applied Magnetics by Barry Hansen
Barry Hansen enthusiasm for Coilgun Designs has created an EE education portal. Applied Magnetics by Barry Hansen See the RLC Simulator and Inductor Simulator. By building a Gauss Gun which is like a Solenoid, Electromagnetic Relay or 3 phase contacter, you can learn electromechanics. This may be like a sequential solenoid which makes things move.This [...]
A Surprisingly Accurate Digital LC Meter
An inductance / capacitance meter by Phil Rice VK3BHR, Almost as published in Amateur Radio magazine, April 2004. A Surprisingly Accurate Digital LC Meter “The AADE web site gave details of how their design worked and a circuit diagram. This led me to propose a design using their oscillator, but in a slightly different way. [...]
ABACOM LochMaster – BreadBoard projects
LochMaster 4.0 is a developers tool for BreadBoard projects. It has useful functions for designing, documenting and testing project boards. A Schematic design has been made, either from experience coupled with testing out application note blocks together. It could also be trying out an idea from a Magazine. If you have simulation tools, you may [...]
Alternate Energy Plans by Lee Bell
At the PackRat WorkShop Lee Bell has archived Power-Energy Ideas, Mechanical Howto and Robot Designs too. Alternate Energy Plans by Lee Bell A Practical Man, His drawings are a language by itself. He has created a useful resource which will keep a DIY Enthusiast busy for many months. Alternate Energy, storing and managing your own [...]
Ultimate 555 timer Design Contest
Create and Submit an innovative 555 design, the 555 should be the heart of the circuit. There has to be a accompaniment of Docs, Tubes and Photos. There are prizes to be won and an impressive list of Sponsors and Participants. I suggest using Google Sites. That way you publish your 555 project in an [...]
Turbokeus Hobby and Electronic Projects
My nixies & nixie clocks, Blue & White 7-segment LED Clocks, PIC16F84 based Dark Room Timer, PIC16F876 based 2-channel Electronic TL-Dimmer. Turbokeus Hobby and Electronic Projects Low drop Temperature Controlled FANregulators with LM2941CT & LF356. Digital Flowmeter for SwissFlow flowsensor. 15V – 7A PWM Speed Controller with NE556 & N-MOSFET for minidrill. 3-digit frequencymeter for [...]
Amplify uV from Sensors to mV for uC
Amplify uV from Sensors to mV levels for A/D Converters, which in turn may drive a display or connect to a uC means MicroController. Now there is unicode I can write μC. Now we will break into small html lesson, paste this as html or put it in the source… μ .. you get this… [...]
Convert Analog to Digital with a V-F
A Low cost A/D with a Potential of 5KV Isolation from Computing elements by use of Normal/Special Opto-Couplers. This can give better resolution and accuracy than a 8 bit A/D. may be close to 10 bit A/D. Added advantage is that you can optically isolate the inputs. Suppose your temperature sensor touches a heating element [...]
