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Current Issue - May 2015

Build this DIY Retro Radio Tube Tech meets Integrated Circuits

Recent Comments
re: Reader Questions Answered Here
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

re: The Lost Art of Strip Board Prototyping
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

re: Hack an LED Desk Lamp
Jim, In a Wiki article at: 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: Events, Advances, and News (3.2013)
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

re: Build Your Own PIC Trainer from Surplus
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

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  • 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...

  • RF Oscillators

    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...