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I also found the oscillator in Mr. Wandishin’s letter of interest (ref your Figure 7). A bit of internet sleuthing found that (1) the “4584N” is a CD4584 Schmidt trigger (six devices), and that Schmitt triggeers can be used as oscillators—see, for example, A Schmitt trigger is a bistable multivibrator,… ~ LL
1.Veroboard has recently become available at Amazon in the US. 2. I prefer creating opens in the traces with a 2.5mm drill instead of scratching with a knife - looks much nicer. 3. A viable alternative are prototyping boards which have the same hole/connection pattern as the plugin-breadboards. Tweak your… ~ Privatier
Jim, In a Wiki article at: http://en.wikipedia.org/wiki/AA_battery it lists the ratings using 500mA for AA batteries of various types. Let’s assume your LEDs and circuits are 50% efficient for the 12 Volt battery running it up to 20 Volts, so it uses 300mA @ 12V to get the 150 mA… ~ PhilKE3FL
RE: TECH Knowledge 2013, March Pg 10, “Slicing with sound” The photo comment says, “Artificial kidney stone with 150 m opto-acoustically created hole.” That must be some extremely large kidney stone to be able to sport a 150 meter diameter hole! I hope it’s not a 150 meter radius hole!… ~ PhilKE3FL
Hi, Thanks for the interest in the Trainer. I design all my own PCBs with an archaic program (runs under Windows 3.1!) which doesn’t support Gerber or other exports. So, sorry, but I can’t help you out. I’ve always just etched my own boards with a homemade affair, using PnP… ~ Thomas_Henry
Wi-Fi on the Big Wire
Classic embedded Wi-Fi web servers based on microcontrollers have met their match. The ACKme Numbat stuffs an ARM microprocessor, Wi-Fi radio, TCP/IP stack, UART, real time clock, multiple GPIO pins, analog-to-digital converters, PWM generators, SPI portals, 1 MB of serial Flash, and an I2C interface into a 0.8” x 0.6” x 0.11” SMT package. All you need is a PC serial port and a terminal emulator to gain access to the Numbat’s rich set of resources. Read More...
Serial I/O Data Interfaces: Part 2
Get familiar with the high speed gigabit serial interfaces that dominate I/O today since we all use at least one of these regularly. Read More...
Move up in frequency to the oscillators which make the signals that drive the ham’s wireless world. Read More...
PICAXE-PC Serial Communication — Part 1
We’ll continue our experiments with the Prolific cable, but this time focus on sending data back and forth between a PICAXE processor and a PC. Read More...
Reader Questions Answered Here (05.2015)
A question on op-amp accuracy, getting certified, and some tips on batteries. Read More...
April 22 - Kickstarter: UDOO Neo
March 31 - The eBay Treasure Hunt
November 26 - Anwser for D Cell or Gell Cell Adapter for Nikon Cameras Use Nikon’s EP5 power supply connector. No camera modification or battery door removal is required. Now the remaining trick is…
August 23 - Anwser for Laser Power Supply Too bad I didn’t read your entry just a little more closely… I have not seen such a powerful diode…
January 28 - Anwser for Traffic Detector Robert beat me to the punch regarding the Doppler. My thought was to install both a Doppler sensor (like a…
November 07 - Tesla Coil Theory Thank’s for answering my question Bart, I was alway’s fascinated with Nikola Tesla inventions and what he did in Colorado…
August 02 - Diode Selection On Multimeter Thanks a lot! GFP.