Published:2013/3/4 21:21:00 Author:Ecco | Keyword: 3x3x3, LED Cube
This circuit drives a 3x3x3 cube consisting of 27 white LEDs. The 4020 IC is a 14 stage binary counter and we have used 9 outputs. Each output drives 3 white LEDs in series and we have omitted a dropper resistor as the chip can only deliver a maximum of 15mA per output. The 4020 produces 512 different patterns before the sequence repeats and you have to build the project to see the effects it produces on the 3D cube.
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Published:2013/3/4 20:59:00 Author:Ecco | Keyword: 2nd Order , Opamp , Filters
The figures below illustrate using opamps as active 2nd order filters. Three 2nd order filters are shown, low pass, high pass, and bandpass. Each of these filters will attenuate frequencies outside their passband at a rate of 12dB per octave or 1/4 the voltage amplitude for each octave of frequency increase or decrease outside the passband.
First order low or high pass cutoff frequency (-3dB point) = 1/(2pi*R*C) 2nd order low or high pass cutoff frequency (-3dB point) = 1/2pi(R1*R2*C1*C2)^.5 Example for 200 Hz cutoff frequency - R1=R2=7.95K, C1=C2=0.1uF
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Published:2013/3/4 3:08:00 Author:Ecco | Keyword: Single- junction transistor, divider ratio , measuring
Single- junction transistor divider ratio measuring circuit is shown as figure.
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Published:2013/3/4 3:10:00 Author:Ecco | Keyword: Reverse , breakdown voltage, test circuit
Reverse breakdown voltage test circuit is shown as figure.
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Published:2013/3/4 3:11:00 Author:Ecco | Keyword: Oxygen
Oxygen circuit is shown as figure.
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Published:2013/3/4 3:09:00 Author:Ecco | Keyword: unijunction transistor , speed measuring
The unijunction transistor speed measuring circuit 1 is shown as figure.
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Published:2013/3/1 2:43:00 Author:Ecco | Keyword: LED, serial , LED digital tube, static display, common anode
LED- serial LED digital tube static display circuit (common anode ) is shown as figure.
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Published:2013/3/1 2:42:00 Author:Ecco | Keyword: LED , serial, LED digital tube , static display , common cathode
LED - serial LED digital tube static display circuit ( common cathode ) is shown as figure.
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Published:2013/3/1 2:39:00 Author:Ecco | Keyword: optocoupler
Basic optocoupler circuit is shown as figure.
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Published:2013/3/1 2:38:00 Author:Ecco | Keyword: temperature compensation , high-precision , integrated pressure, signal conditioner
The temperature compensation circuit of high-precision integrated pressure signal conditioner MAX1457is shown as figure.
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Published:2013/3/1 2:33:00 Author:Ecco | Keyword: Precision, op amp, zero circuit
Precision op amp zero circuit is shown as figure.
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Published:2013/2/28 1:20:00 Author:Ecco | Keyword: Leakage indicator
Leakage indicator circuit is shown as figure.
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Published:2013/2/28 1:18:00 Author:Ecco | Keyword: logic test
The logic test circuit is shown as figure.
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Published:2013/2/28 1:16:00 Author:Ecco | Keyword: Speaker, voice coil , detection circuit
Speaker voice coil detection circuit is shown as figure.
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Published:2013/2/28 1:15:00 Author:Ecco | Keyword: Quartz crystal oscillator, test circuit
The quartz crystal oscillator test circuit diagram is shown as figure.
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Published:2013/2/28 1:12:00 Author:Ecco | Keyword: Local , coil , short-circuit, test circuit
Local coil short-circuit test circuit is shown as figure.
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Published:2013/2/27 20:59:00 Author:muriel | Keyword: Headlight Alarm
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Published:2013/2/27 20:58:00 Author:muriel | Keyword: Glowplug Panel (b)
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Published:2013/2/27 20:57:00 Author:muriel | Keyword: Glowplug Driver (a)
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Published:2013/2/27 20:57:00 Author:muriel | Keyword: Gel Cell Charger, II
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