Skip navigation
Electronics Industry Search
Advertisement
Email
Print
Reprints/License
RSS

Gadget Freak Case #105: KeyCom Helps Keep Everybody in the Same Key

By Design News Staff -- Design News, July 16, 2007

There was dissonance in the church when the pianist and other musicians had to hunt for the key their Music Leader was playing in. Dick's gadget took the guesswork out of the guitar, the meandering out of the mandolin and the pondering out of the piano. The Music Leader communicates the key to the others by setting the display on his Sending Unit via pushbutton or the foot switch, and the Remote Units replicate that display for everyone else. Now, they're all in one A chord (or F, or C, or...).

Build Instructions | View Parts List | Post a Comment

Amt Part Description Allied Part #
1 7-Segment Display, Common Anode, Right Decimal, 0.8 inch 782-0570
1 7-Segment Display, Common Anode, Right Decimal, 13 mm 431-0048
16 1N914 Diode 431-0618
13 2N7000 N-channel MOSFET 568-0741
4 2N2222 NPN transistor 248-1004
4 1N4004 rectifier 266-0004
1 1N4742A Zener, 12V 1W 431-0332
1 CD4001 CMOS Quad 2-NOR 735-0960
1 CD4002 CMOS Dual 4-NOR 735-1065
1 CD4013 CMOS Dual D-flop 735-1325
1 CD4051 CMOS 8-ch MUX/DEMUX 735-0989
1 CD4070 CMOS Quad XOR 735-1002
1 CD4073 CMOS Triple 3-AND 735-1343
1 CD4081 CMOS Quad 2-NAND 735-1015
1 CD4093 CMOS Quad 2-NAND, Schmitt Trigger 735-1023
2 CD4099 CMOS 1 of 8 Decoder/Latch 735-2444
1 CD4516 CMOS 4b Up/Down Counter 735-1038
1 MC14526 CMOS 4b Presettable Down Counter 568-0877
2 RJ25 Right Angle jack w/ panel stops 374-5770
1 3.5 mm stereo phone jack (needs nut & washer) 283-0352
1 3.5 mm stereo phone plug w/ strain relief 283-3291
2 Push-button switch, NO, bushing mount w/ nut & washer 250-3241
Red Tail light tape (Automotive store item) Additional hardware & passive components, See Text
Get Build Instructions 
Advertisement

Sponsored Content

Technology Marketplace

Email
Print
Reprints/License
RSS
Find a supplier on oemsuppliersearch.com

Advertisement
Reed Business Information Resource Center

Featured Company


Advertisement

Design News Partner Zones

Light Matters: The Unsung Heroes of Modern Health Care
First, let's define "no-compromise." In an ideal configuration, this lamp would use a high-brightness LED (HBLED) that is built into a small, integrated package and is able to produce a large quantity of focused light, operate with a high level of reliability and generate no audible noise. Is this difficult? Yes, but it is possible.
Read More


Design Engineers' Portal for Sensing and Machine Safety
Whatever industry you're in, or whatever product you manufacture, the right sensors to automate your plant, and to improve your overall efficiency, quality and safety are a must. You'll find Banner Engineering to be an amazing resource of products, training and people with expertise.


Test & Measurement World Machine Vision & Inspection Report
Topics include machine-vision software, Power over Camera Link, thermal imaging and frame grabbers. Read More

Design News Partner Zone Directory »

Please visit these other Reed Business sites