Hobby Hound

Practical Electronics Learning with DIY. Practical Experiments forge the book, college or web learning into a Skill.

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Saturday, September 05, 2020

PJ Tool & Supply - Papa John’s Toolbox

They have unique variety of  tools for professionals, hobbyists, and do-it-yourself enthusiasts.The Business started 50 years ago by buying and selling of surplus merchandise from the US Military

PJ Tool & Supply - Papa John’s Toolbox

The Helping Hands magnifier is a great hands free device for holding small items in a fixed position for soldering and other intricate work.

Helping Hands Magnifier

Helping Hands Magnifier

PJ Tool & Supply
40-H Corbin Ave. Bay Shore, NY 11706, USA

Thursday, September 03, 2020

Step Down Capacitor - No Heat

Sometime in the eighties, I had to change a blind timer design due to non-availability of a component. A high resistance relay 600 ohm coil was not in supply, 150E was available. The Power to timer was derived from a resistor, I put a 0.47uF 630V and it Worked !. This design of mine, deriving a low voltage from a capacitor shown on right adaptation became popular. I used a 0.47uF 440V AC or 630V DC Plastic Capacitor.

This circuit has been drawn from my memory and i have not tried it out again, just see if it is ok and then try. You should use the fuse of 100mA a slow blow if you want but it is very important. This circuit has to be enclosed in a plastic sealed enclosure to avoid contact.

Mains Voltage Indicator with a LED
Mains Voltage LED Indicator

Tuesday, September 01, 2020

Cornfield Electronics - Mitch Altman

Mitch Altman, president and founder, invented the company's hit product TV-B-Gone® and turned the product into an international success practically overnight.

Cornfield Electronics - Mitch Altman

Solder your ArduTouch kit together, and it works! You can make way wonderful music, sound, and noise.

Cornfield Electronics - Mitch Altman

Use the ArduTouch Library or hack the existing sketches to create your own cool synthesizers.
The documentation is getting good enough to learn how to use Digital Signal Processing (DSP) to make your own sounds for your own projects.

Cornfield Electronics, Inc.
1800 Market St. #123 San Francisco, CA 94102, USA