56 Circuits for the Hobbyist.pdf

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Circuits for the Hobbyist
For your electronics hobby entertainment; ENJOY!
It is assumed that you have AT LEAST the equivalent of a Basic Electronics certificate for the
electronics projects listed on this page. Other projects require more advanced electronics. A lot of
these circuits assume the latter so I will no longer answer the tons of emails in regards to that. If you
wish to learn more about electronics there is enough of that available on the internet.
Circuits' Message Board Ask your questions here. Someone may answer them.
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6-13-2002
6-28-2002
PLL - Almost done!
Coils
Integrated Circuits
Make Your Own Shunts
Relays, Relay Drivers, Solid-State
"Green" means on-line, "Red" means off-
line
8-
Bookmark this valuable page with
'Ctrl-D' .
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Circuits Archive - Older circuits. Most are working, some are not. Could be still useful.
Radio Shack Partnumbers - Most common order numbers for my circuits
Tandy Corporation - European/Australian counterpart of Radio Shack
TUP/TUN/DUS/DUG European transistor replacement system
Tomi Engdahls' Page - Solid electronics projects!
Jan Freak's Page in the Netherlands - Well thought out information. Dutch language only
Bowden's Hobby Circuits - Collection of circuits, for everyone.
Circuit Exchange International - Andy's website. Good selection of excellent circuits
Electronic Tutorials - Collection of electronics tutorials.
Dolbowent.Com - Electronic Surplus and Engineering Support.
Jordan's Electronics Page - Lots of good circuits here also.
LED Webpage. White Led's everywhere - Malcom's site in the UK.
Guelph Amateur Radio Club - GARC--Official Homepage
PA3BWK's Ultimate Morse Code Website - Wilko Hollemans site in the Netherlands
ElectronicsZone - Naveen's Website
Spark Museum - John D. Jenkins amazing collection of antique wireless & scientific instruments
DISCLAIMER: I take no responsibility whatsoever for the use and/or implementation thereof, or the
misuse leading to damage to equipment, property, or life, caused by the above circuits. Check with local,
provincial and federal laws before operating some of these devices. You may also check your life
insurance and/or the fact if they cover death by electrocution if you intend to play with Micro-wave
ovens and other lethal HV devices. Safety is a primary concern when working with high power circuits
or con/inverters. Play it safe!
to home page
Copyright © 1995 - Tony van Roon. ALL RIGHTS RESERVED.
Last Updated: August 7, 2002
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Alternating ON-OFF Control
by Tony van Roon
Use this circuit instead of a standard on-off switch. Switching is very gentle. Connect unused input pins
to an appropriate logic level. Unused output pins *MUST* be left open!. First 'push' switches ON,
another 'push' switches OFF. You can use 1/4 watt resistors if they are metal-film type. Any proper
substitute will work for Q1, including the european TUN's. For C2, if you find the relay acts not fast
enough, leave it out or change to a ceramic cap between 10 and 100nF.
Parts List
All resistors are 1/2 Watt and 5% tolerance.
R1 = 10K
R2 = 100K
R3 = 10K
C1 = 0.1µF, Ceramic
C2 = 1µF/16V, Electrolytic
D1= 1N4001
Q1 = 2N4401 (ECG123AP, NTE123AP, etc.)
IC1 = 4069, CMOS, Hex Inverter (14069), or equivalent
S1 = Momentary on-switch
Back to Circuits page
Copyright © Tony van Roon
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Audio Pre-Amplifier
Additional Notes
(N/A)
Back to Circuits page
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