Alan Yates' Laboratory - The Curious C-Beeper. This little toy I've been meaning to build for many years.
I finally got around to it today, and I already don't know how I lived without it. Build one, they are really useful. I built Daniel Garcia's version of Charles' original circuit. I substituted E12 preferred values and had to tweak the 33k resistor between the base of the last transistor and the +ve rail to set the quiescent current < 30 uA. I used BC549C and BC559C transistors - high gain is important, I haven't tried with vanilla 2N3904/6, you might need to burn more current if you use them. Here's a quick video of me beeping out a hack "PCB" for the Day 4 Advent project (the sniffer/wavemeter). I'll probably replace the sharpened bit of Copper wire with a bright Nickel or Gold plated test probe at some point.
High-res Cap meter by RomanBlack. [Back to Home Page] www.RomanBlack.com High res cap meter with PIC 16F628High resolution capacitance meter measures in 0.01pF digits.
Total range 0pF to 50uF. - 27th Jun 2011, Updated 25th may 2013. Another PIC based capacitance meter? Although there are a few PIC based "pico" capacitance meters on the internet this design has some advantages over the other designs I have seen; 1. How it works For absolute simplicity I used a PIC16F628. The oscillator is an RC comparator oscillator that switches between 1/3 Vdd and 2/3 Vdd, this is a proven system and the frequency is reasonably unaffected by small changes in the 5v Vdd.
The three 1k5 resistors (green) set the threshold voltages at 1/3Vdd and 2/3Vdd when the comparator output switches. The oscillation period (freq) is set entirely by RT and CT. The final stage is the PIC timer, that measures the oscillation period very precisely compared to the PICs xtal. Precision period measuring! There are three display ranges; Display accuracy? Building it. Very Accurate LC inductance / Capacitance Meter. Bus Blaster: Programming the STM32F4 DISCOVERY. LC Meter using a Microchip PIC 16F628A - Hacked Gadgets - DIY Tech Blog.
This LC Meter was built using a Microchip PIC 16F628A.
It would make life a bit easier when attempting to identify a few of those components that are always left over on the desk after building a project. Mine are often dumped into a miscellaneous box with other various components which makes it even more difficult to identify later… I think this meter would make a great addition to my bench. It was built based on the design by Phil Rice which can be found here. The original design was powered by a 9 volt battery but the new design uses a 3.6V battery which required substantial changes to be made in the power section of the project.
Have a look at the image below that shows the super tiny component that was used in the design, it must have been quite a feat to get this mounted onto the hand made board! “I wanted to fit it in this project box that I had laying around for some time and I also wanted it to be battery powered. Digital LC Meter Version 2 - VK3BHR.
Function generator circuit. See Other projects in : Oscillator And: Cheap function generator Posted by admin - August 19, 2011 at 4:44 pm Function generation circuits, suitable for use or test the various electronic circuits.
The circuit uses IC to work directly. The high efficiency. In some circuits, a simple device. Function Generator Jul 10, 2009 … The simple Function generator two waveform, It produces triangle and square waves from 1Hz up to 1MHz. Single supply Function Generator by TLC271 The circuit has both square-wave and triangle-wave output. Waveform Generator with ICL8038 That circuit is based on a 14-pin DIL ICL8038 capable of producing sine, square, triangular, sawtooth and pulse waveforms of high accuracy and stability…. Simple Function generator by LM566 The simple Function generator two waveform, It produces triangle and square waves from 1Hz up to 1MHz.
Signal Generator by IC 8038 ICL8038 signal generator chip, manufactured by Intersil. Note If you are interested in this circuit. Click Here.