The RF oscillator using the inverter U1B and 10.7Mhz ceramic filter is driving the parallel combination of U1D to U1F through U1C.Since these inverters are in parallel the output impedance will be low so that it can directly drive an aerial of ...

Simulation Model To model this circuit in LTspice or any other simulator you have to take into account the input capacitance of the probe cable, and the impedance of the inductor itself. The cable capacitance was measured by a capacitance meter and ...

Andy Collinson Description An electromagnetic field probe designed to detect changing electric and magnetic fields. The probe has switchable gain, a frequency response up to 400kHz and independent audio and meter monitoring. Click to enlarge ...

Electronic Design Europe David Tomanek This Design idea was inspired by a requirement for a sunrise detector with low power consumption, reliable light detection, and a real sleep mode during darkness. The sleep mode of the microcontroller with a ...

This multimeter was designed to measure output voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. ...

Vassilis Serasidis Introduction. It's been passed a lot of years since my first SMS remote control. The reason I stoped developing the source code of my previous circuit was that the T10s was not available in the market sinse a lot of years. So, ...

Zhihong Yu, Juno Lighting Group, Des Plaines, IL; Edited by Martin Rowe and Fran Granville Power three to six LEDs from an ac- or dc-power source and charge a backup battery. LEDs find wide use in emergency lighting because of their high efficiency ...

Till Harbaum Uploading the firmware If you are familiar with Atmel programming you probably know what you are doing. The Makefile in lcd2usb/firmware/Makefile assumes, that you are using a simple STK200 compatible printer port adapter . Connect the ...

Description Here is a simple circuit that can be used as a tachometer. The circuit is basically a frequency to current converter which converts the incoming signal into a proportional current to drive the meter. The deflection on the ammeter will ...

This tool assists you in tuning your string instrument to a given tone. It utilizes the stroboscopic effect to give feedback about the adjustment of your instrument. The two LEDs on the board blink with the frequency that the chosen tone has. When ...

Power-up Once you have a transmitter-receiver pair of devices assembled, it's time for the first test. We recommend to use a single computer for testing both devices. First, power down the computer and connect the transmitter unit between the PS/2 ...

Introduction Familiar with the concept of hardware keylogging? A hardware keylogger is a perfect solution for monitoring user activity, at very low risk of disclosure. A hardware keylogger is a purely electronic device, so no access to the ...

Till Harbaum Overview LCD2USB is a open source/open hardware project. The goal of LCD2USB is to connect HD44780 based text LCD displays to various PCs via USB. LCD2USB was meant to be cheap and to be made of easily available parts. It is therefore ...

Description. With a matching antenna, the FM transmitter circuit shown here can transmit signals up to a range of 2 kilo meters. The transistor Q1 and Q2 forms a classic high sensitive preamplifier stage. The audio signal to be transmitted is ...

Introduction: Frequency counter is a very important test instrument for Radio Amateurs, especially those who wish to develop or test circuits. There are lots of frequency counters in the market but building one was never so easy exciting with ...