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<html> <a href="http://www.kpsec.freeuk.com/index.htm">Electronics Club</a><br> <a href="http://www.geocities.com/dsaproject/electronics/cook-book/cook-book.html">Collection of circuits</a></br> <h1>Capacitors</h1> 42 = 42 pico-farad</br> 103 = 10 x 10<sup>3</sup> pico-farad = 10,000 pf = 10 nf<br> 104 = 10 x 10<sup>4</sup> pico-farad = 100,000 pf = 100 nf = 0.1 uf<br> 105 = 10 x 10<sup>5</sup> pico-farad = 1,000,000 pf = 1000 nf = 1 uf<br> Positive lead is usually longer; Negative lead may have mark. <a href="http://wiki.xtronics.com/index.php/Capacitor_codes">more...</a> <h1>7400 TTL</h1> <a href="http://www.markbereit.com/rsrc/ccdig_74ls.html">more...</a> <h1>LEDs</h1> <ul> <li>Longer lead is positive. <li>Flat edge inside (if visible) is usually negative. </ul> <h1>Tester</h1> <img src="tester.gif"> <h1>Clock generator</h1> <h2>Normal clock</h2> <a href="http://www.uoguelph.ca/~antoon/circ/clock1.htm"> http://www.uoguelph.ca/~antoon/circ/clock1.htm</a> <br> <img src="clock1.gif"> <br> <ul> <li>Excellent clock generator to drive 4017 type cmos circuits. <li>R1 = 10K to 10M, C1 = 100pF to 47uF. <li>Fo is ±1Kz when R1=100K and C1=10nF. <li>Input voltage can be from 5 to 15V. </ul> <h2>Single-step clock</h2> <img src="ssclock.gif"> <h1>Reset</h1> <br> <img src="reset.png"> <h1>Notes</h1> 20081130 - Why does the simple clock circuit based on 74LS00 not oscillate? </html>