Electronics-Lab.com Blog

Derek Wolfe writes:

This circuit provides a pulse width modulation (PWM) signal for varying the duty cycle of a load from 1-99% using a potentiometer. This is a useful way to control motor speed, LED brightness, etc.

PWM Power Supply - [Link]

Derek Wolfe writes:

This circuit allows a simple switch or a low voltage pulse (5V for example) to control a large dc load. There’s a good explanation of MOSFET transistors and how to use them as a switch here. This is great for connecting a large load to a microcontroller or other logic circuit. Power MOSFET transistors are perfect for this application and can handle high voltage and current (100V, 77A for the NTP6411). This design would be able to power almost any load you can think of (probably even your car).

N-Ch Power MOSFET Switch - [Link]

PowerEsim.com writes:

PowerEsim- Free on-line switch mode power supply SMPS, circuit and transformer design, calculation, simulation software. More than 100 circuits and topologies are available with real constructed transformer.

It provides a virtual laboratory environment for users to wind and place every single turn of a transformer, and with the help of tens of thousands real modeled component on the market, user can simple pick and place the real component and stuff into the circuit, within a fraction of a second, our server will immediately return the result to the user. It is even faster than modifying prototype in real environment, and more than that is no worry of getting explosion of the prototype on real bench. It is Better than real.

PowerEsim – Free SMPS Switching Power Supply / Transformer Design Software - [Link]

Simple and interesting circuit to fade LEDs. Watch effect on the link. It’s cool.

LED Fade – Pulsing Effect - [Link]

• Three terminal adjustable regulator
• Output current of 7.5A
• Line regulation 0.015%
• Voltage control 0.1%
• Available in 3 package, TO-220, TO-3P and DD

LT1083 Low Dropout Adjustable Power Supply 7.5A @ 1.2 to 25Volts - [Link]

electronicsblog.net writes:

GPS for accurate synchronization and  position measurement must use precise clock, so GPS satellites are equipped with atomic clocks. Clock accuracy is amazing ± 1 second in 1 million years. Using GPS module is available not only acquire position, speed, bet also time and date, so in this post I’ll explain how to do it.

GPS clock consist of old Sirf II GPS module, MAX 232, Arduino Mega and LCD display (Hitachi HD44780).

Sirf II module has RS-232 interface for communication and it can be  connected to PC Com port. Atmega in Arduino board has  UART interface. RS-232 basically is the same UART, only zeros and ones voltage levels are different. To match levels MAX232 driver is used. Today’s GPS modules have UART port, so there isn’t any need for MAX232.

Arduino GPS clock using NMEA protocol - [Link]

This is a PDF in English published in 1947 and features 45 complete schemes of tube amps, including diagram drawing material list and description of operation. Ideal for anyone interested in old amplifiers (Vintage) and the supporters as well as a modern valve amplifier. The power of the circuits presented in the book ranges from 1 to 75 Watts.

Practical Amplifier Diagrams – Tubes Audio Power Amplifiers - [Link]

electronicsblog.net writes:

Old wish to make digitally controlled FM tuner come true when I found on Ebay cheap module with TEA5767 (Low-power FM stereo radio for handheld applications).

This module size is only 11.2mm x 11mm. TEA 5767 supports I2C.

For antenna i have used just 75 cm long wire, because that is 1/4 of wavelength at 100 MHz. TEA5767 doesn’t have audio amplifier, sound output level is very low, headphone can not be connected directly. During testing i had connected audio output to PC audio system.

Arduino FM receiver with TEA5767 - [Link]

The excellent book on transmitters that offer contains 467 pages of information in English about transmitters. Radio Transmitters was published in 1961 by engineers at the laboratory of ITT radio transmission.

Here’s a whole book dedicated to transmitters! Targeted at professional engineers rather than hams, this covers it all from oscillators through power amps, modulators, power supplies, and antenna matching.

Radio Transmitters – Tube power RF Circuits - [Link]

Everyone interested in analog electronics should find some value in this book, and an effort has been made to make the material understandable to the relative novice while not too boring for the practicing engineer. Special effort has been taken to ensure that each chapter can stand alone for the reader with the proper background. Of course, this causes redundancy that some people might find boring, but it’s worth the price to enable the satisfaction of a diversified audience.

Texas Instrument – Op Amps For Everyone - [Link]