Another app note from IXYS on P-Channel power MOSFET application. Link here (PDF) IXYS P-Channel Power MOSFETs retain all the features of comparable N-Channel Power MOSFETs such as very fast switching, voltage control, ease of paralleling and excellent temperature stability. These are designed for applications that require the convenience of reverse polarity operation. They have […]
Guidelines for parallel operation of IGBT devices discuss in this app note from IXYS. Link here (PDF) As applications for IGBT components have continued to expand rapidly, semiconductor manufacturers have responded by providing IGBTs in both discrete and modular packages to meet the needs of their customers. Discrete IGBTs span the voltage range of 250V […]
cVert, a truly random MIDI controller @ danny.makesthings.work cVert is the result of an idea I’ve been kicking around for years, and took a few months of work to bring to fruition. The idea was to use a Geiger counter as a true random number generator to give a non-deterministic input for computer art or […]
An ATmega328 based portable home made oscilloscope with ADC from Creative Engineering: It is basically a small scaled digital oscilloscope. It is capable of displaying all type of waveform like sine, triangular, square, etc. It’s bandwidth is above 1 MHz and input impedance is about 600K. The device is mainly using the ATmega328 micro-controller as […]
Jeff (aka K6JCA) did a repair of an HP 3438A digital multimeter and documented the whole process on his blog: This blog post is a record of my notes made while repairing an HP 3438A Digital Multimeter I had picked up last year at a local electronics swap meet. The 3438A is a 3.5 digit […]
Ken posted an article taking a closer look at Intel 8087 chip: Intel introduced the 8087 chip in 1980 to improve floating-point performance on the 8086 and 8088 processors, and it was used with the original IBM PC. Since early microprocessors operated only on integers, arithmetic with floating-point numbers was slow and transcendental operations such […]
Bob writes: I am working on some Arduino biometric designs perhaps for a new book. So far I have created the two line 1602 LCD display and now the Nokia 84×48 display. The Nokia display is more fun to work with since I can do a oscilloscope like display across the screen. I am working […]
Facelesstech has published a new build: So I recycled the Arduino pro micro off of one of my old controllers, In doing so I messed the pin 16 up so I had to use one of the analog pins instead. The wiring was quite simple really. I ran a ground wire round all the buttons, […]
A detailed instructions of how to build an ATmega 1284p based data logger: In this tutorial, a logger is built using a 3.3v Moteino MEGA with a 1284p CPU @ 16Mhz, w 4K eeprom,16K SRAM for variables & 128K program space. Considerably more than the 328’s 1K eeprom, 2K ram & 32K progmem. Also has […]
Vintage computer Tandy 1000 upgrade @ smbaker.com: A Tandy 1000 was the second computer that I owned, the first was a Tandy CoCo. Note that I keep a slightly different mental “computers that I owned” list and “computers that I used list”. There are a few computer I was able to gain access to and […]
This application note from SiTime gives practical guidelines for the effective probing of oscillator output, shows common mistakes and explains how to identify and avoid potential probing issues. Link here (PDF) Electrical engineers often use oscilloscopes for purposes ranging from checking simple, lowspeed digital signals to accurate waveform and jitter measurements. They need to use […]
App note from SiTime about Voltage controled crystal oscillator (VCXO) specification, Link here (PDF) VCXO are frequency control devices that allow change of output frequency as their input voltage varies. In selecting a VCXO for any application, a number of device performance specifications must be considered. This application note attempts to clarify the key VCXOspecific […]
Fwacer shared detailed instructions of how to build this shortcut keyboard from an old cash register, project instructables here. More details at brycedombrowski.com.
Ken Shirriff writes: I saw an ad for a tiny chip1 that provides 5 volts2 of isolated power: You feed 5 volts in one side, and get 5 volts out the other side. What makes this remarkable is that the two sides can have up to 5000 volts between them. This chip contains a DC-DC […]
Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]
Doz did a repair of a Dual PA5030 Integrated amplifier and documented the whole process on his blog.
Stynus blogged about his 12V 25A power supply: To test my LED Stair Lighting Controller boards I needed a 12V power supply that can deliver a lot of current. For this I chose a SP-320-12 from meanwell. However with the screw terminals it is not easy to use on a lab bench, also there is […]
Silicon Lab’s basics of USB Human interface device (HID) and how this class communicate to PCs. Link here (PDF) The Human Interface Device (HID) class specification allows designers to create USB-based devices and applications without the need for custom driver development.
Application circuit of supercapacitor ENYCAP(TM) power management from Vishay. Link here (PDF) The MAL219699001E3 demonstration circuit is a fully transparent power management solution with a regulated 2 W output and integrated power backup. It provides a DC/DC regulator with a wide power input range from 4.0 V to 20 V and adjustable regulated output between […]
Turning 930 logic gates into a working 6502 Apple-1 clone: Two years ago, the Gigatron arrived on the retrocomputing scene. It needs just 930 logic gates (packed into 33 standard 7400-series ICs) to create a computer that beat ‘complex’ 1980s home computers like the VIC-20 in terms of both CPU power and graphics. Without microprocessor, […]