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Old Dog, New Tricks: 555 Timer in the trash
It's nice to have a simple victory once in a while :) A quickie project needed a 14 Hz square wave, with a true 50% duty cycle. No exact tolerances available, but "good"... In...
Wednesday, 8 April 2009 - 01:21
Dragon Reads Signature, Once (Solved)
Lots of threads on Dead Dragons... I'm not sure if this behavior is symptomatic of a dead/dying dragon, or just Operator Error. Knowing that the Dragon is a sensitive device, I...
Wednesday, 11 March 2009 - 18:00
Micro Weezer
On the AVRFreaks Main Page there is a News item for an AVR Study Board using the Mega16, by inovacs. Under 'read more' it lists that the board includes a Weezer. A few clicks...
Friday, 6 March 2009 - 06:31
Out with the old, In with the new, Scope that is
Perhaps a few other "oldtimers" have built or played with a Heathkit oscilloscope. I built lots of their kits. My Model 10-14 scope let out a muffled pop and a cloud of smoke,...
Saturday, 3 January 2009 - 00:53
Dip Socket with Round Holes
I mistakenly purchased a few of these 28 pin dip sockets with round holes, thinking I was buying the sockets I'm use to with two flat contacts that press together. Although I can...
Tuesday, 23 December 2008 - 02:18
SMT Beginner: Cap Polarity Band
I'm working on my first SMT board, trying hard to teach an old dog new tricks... I have an 0805 10 uF electrolytic capacitor. As if 1206 isn't small enough for a beginner, but...
Thursday, 2 October 2008 - 21:54
External Oscillators, Signal Amplitude, 25MHz, (AD9833)
As I stumble my way through an "RF" project I keep coming up with more questions than answers. "Simple Project", a simplistic, (i.e. Hobbist grade), signal generator using the...
Monday, 11 August 2008 - 21:34
Signal Generator Output Stage Op Amp
I'm designing a simple Signal Generator and could use some thoughts on its output stage. Its intended application is to tinker and play with on my workbench, hence it need not be...
Monday, 28 July 2008 - 00:42
RS232 Pull Up/Down/Indeterminant ?
I'm adding a Max232, (or equivalent), type chip to a circuit, and thought I would stick a Pull Up or Pull Down resistor on the RS-232 Input line. If there is no device connected...
Tuesday, 15 July 2008 - 00:58
Cyclindrical, not flat, circuit boards
I'm contemplating a project that would really benefit from a cyclindrical, not a flat, circuit board. The board would actually just bend 90 degrees, it would not be a full circle...
Tuesday, 1 July 2008 - 21:52
Weatherproof Keypad
I am looking for a weatherproof keypad for use as an outside mounted garage door opener. Enter the correct code, door opens. Weather: Freezing rain, sub freezing to ~100'F...
Friday, 18 April 2008 - 00:02
Bi-Polar Wall Wart Power Supplies
A current project for myself, not for production, requires a bi-polar power supply, +/- 12 V, at about 100 mA on each supply. I would like it to be fairly tightly regulated, and...
Saturday, 8 March 2008 - 16:42

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