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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
December 18 - Just in Time Parts vs. the Junkbox
October 28 - Save Time and Money Making CNC Halloween Decorations
October 22 - The Internet of Things
October 02 - WiDo - Open Source IoT Node (Arduino Compatible)
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.