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Static Electricity Sensor
PARTS AND MATERIALS One N-channel junction field-effect transistor, models 2N3819 or J309 recommended (Radio Shack catalog # 276-2035 is the model 2N3819) One 6 volt battery One 100 kΩ resistor One...
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Pulsed-light Sensor
PARTS AND MATERIALS Two 6-volt batteries One NPN transistor—models 2N2222 or 2N3403 recommended (Radio Shack catalog # 276-1617 is a package of fifteen NPN transistors ideal for this and other...
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Voltage Follower
PARTS AND MATERIALS One NPN transistor—models 2N2222 or 2N3403 recommended (Radio Shack catalog # 276-1617 is a package of fifteen NPN transistors ideal for this and other experiments) Two 6-volt...
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7-segment Display
PARTS AND MATERIALS 4511 BCD-to-7seg latch/decoder/driver (Radio Shack catalog # 900-4437) Common-cathode 7-segment LED display (Radio Shack catalog # 276-075) Eight-position DIP switch (Radio Shack...
View ArticleThe 555 IC
The 555 integrated circuit is the most popular chip ever manufactured. Independently manufactured by more than 10 manufacturers, still in current production, and almost 40 years old, this little...
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555 Schmitt Trigger
PARTS AND MATERIALS One 9V Battery Battery Clip (Radio Shack catalog # 270-325) Mini Hook Clips (soldered to Battery Clip, Radio Shack catalog # 270-372) One Potentiometer, 10 KΩ, 15-Turn (Radio Shack...
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555 Hysteretic Oscillator
PARTS AND MATERIALS One 9V Battery Battery Clip (Radio Shack catalog # 270-325) Mini Hook Clips (soldered to Battery Clip, Radio Shack catalog # 270-372) U1 – 555 timer IC (Radio Shack catalog #...
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555 Monostable Multivibrator
PARTS AND MATERIALS One 9V Battery Battery Clip (Radio Shack catalog # 270-325) Mini Hook Clips (soldered to Battery Clip, Radio Shack catalog # 270-372) A Watch with a second hand/display or a Stop...
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CMOS 555 Long Duration Minimum Parts Red LED Flasher
PARTS AND MATERIALS Two AAA Batteries Battery Clip (Radio Shack catalog # 270-398B) One DVM or VOM U1 – T One CMOS TLC555 timer IC (Radio Shack catalog # 276-1718 or equivalent) D1...
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CMOS 555 Long Duration Blue LED Flasher
PARTS AND MATERIALS Two AAA Batteries Battery Clip (Radio Shack catalog # 270-398B) U1 – 1CMOS TLC555 timer IC (Radio Shack catalog # 276-1718 or equivalent) Q1 – 2N3906 PNP Transistor (Radio Shack...
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CMOS 555 Long Duration Flyback LED Flasher
PARTS AND MATERIALS Two AAA Batteries Battery Clip (Radio Shack catalog # 270-398B) U1, U2 – CMOS TLC555 timer IC (Radio Shack catalog # 276-1718 or equivalent) Q1 – 2N3906 PNP Transistor (Radio Shack...
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CMOS 555 Long Duration Red LED Flasher
PARTS AND MATERIALS Two AAA Batteries Battery Clip (Radio Shack catalog # 270-398B) A DVM or VOM U1 – CMOS TLC555 timer IC (Radio Shack catalog # 276-1718 or equivalent) Q1 – 2N3906 PNP Transistor...
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USB-C Set to Change Course of Technology
Built on the USB 3.1 spec and much smaller than a standard USB-A connector, USB-C can provide enough power to charge a laptop, enough bandwidth to carry a display signal, and fast enough data speeds...
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Tusikubali Kuvurugwa Tuwe Makini Tufanye Maamuzi Sahihi
Watanzania wameonywa kuwa makini kwa kutokubali kuvurugwa na watu wanaotangaza nia ya kugombea Urais katika uchaguzi mkuu wa Oktoba mwaka huu, badala yake wafanye maamuzi sahihi kwa kumchagua...
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Urais 2015: Kambi Ya Lowassa Yazidi Kutanuka……..Naibu Waziri wa Nchi, Ofisi...
NAIBU Waziri wa Nchi Ofisi ya Makamu wa Rais (Mazingira), Steven Masele, ametangaza kumuunga mkono Waziri Mkuu wa zamani, Edward Lowassa katika harakati zake za kuwania urais kupitia Chama Cha...
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Urais 2015: Benard Membe Anusurika Kufa Baada ya Ndege yake Kutaka Kugongana...
Mio za kuwania kumrithi Rais Jakaya Kikwete miongoni mwa makada wa Chama Cha Mapinduzi (CCM) zimezidi kushika kasi, safari hii Waziri wa Mambo ya Nje na Ushirikiano wa Kimataifa, Bernard Membe,...
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Urais 2015: Profesa Lipumba Kuchukua Fomu ya Urais Jumapili ya Wiki...
Mwenyekiti wa Chama cha Wananchi (CUF), Profesa Ibrahim Lipumba, Jumapili atachukua fomu ya kugombea urais ndani ya chama hicho na atawaeleza Watanzania sababu ya kuwania nafasi hiyo. Akizungumza...
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Urais 2015: January Makamba Apokelewa Kishujaa Mkoani Iringa, Apata Wadhamini...
Naibu Waziri wa Mawasiliano, Sayansi na Teknolojia, January Makamba, ameungwa mkono na Umoja wa Vijana wa Chama Cha Mapinduzi (UVCCM) mkoani Iringa ambako alipata wadhamini zaidi ya 600. Akizungumza...
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How to build Geomagnetic field detector
This basic oscillator will detect the Earth magnetic field. The ferrite rod and coil are taken from an old Medium Wave receiver and a small magnet is glued at one end. Tune to a medium wave commercial...
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How to build Frost Alarm
The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger...
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