Published:2011/5/26 2:38:00 Author:Christina | Keyword: Index, operation
The index operation circuit is the inverse operation of the logarithmic operation, you can exchange the index operation circuit's diode (transistor) and the resistance R. The circuit is as shown:
By using the logarithm and index operations and the proportions, also the differential operation circuit, we can form the multiplication or division operation circuit and other nonlinear operation circuits. (View)
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Published:2011/5/30 22:19:00 Author:Borg | Keyword: remote control, 888 domestic fans
The model of infrared receiving pipe is coupled with the emitting pipe, the selection of wave length and light power should be noticed. IC1 is fixed with the special infrared receiving chip μPC1373 of color TV remote controls, when L and C4 circuits are modulated at the central frequency of 38kHz, an infrared pulse signal is received, and after magnification, detection and rectification by IC1, a low-LEV signal is output, then VT2 is blocked, and the high LEV signal of c pole is added to the input terminal of IC3 clock, then the clock starts to count, and Q1(2-pin) generates a high LEV pulse, the electric IC4-a and VT5 are conducting.
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Published:2011/5/26 22:04:00 Author:Christina | Keyword: Water level, indicator
Circuit operating principle
This water level indicator circuit is composed of the water level detection electrode A-E, the voltage stabilization diode VS, the resistors Rl-R9, the four op-amps Nl-N4 and the LED VLl-VM, as the figure shows.
When there is no water in the tank, the reversed-phase input port voltages of the op-amps Nl-N4 are higher than +5V, so the Nl-N4 output the low electrical level, the LEDs VLl-VL4 turn off.
When the water level of the tank gets to the electrode D, the water resistance connects the electrode D with the electrode E to make the operational amplifier Nl's inverting input port (pin-2) voltage lower than +5V.
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Published:2011/5/30 3:39:00 Author:Christina | Keyword: oscilloscope
Download thematerial: 2004111917543980.pdf (View)
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Published:2011/5/30 3:44:00 Author:Christina | Keyword: Ultrasonic wave, blindman, road finder
The Ultrasonic wave blindman road finder circuit is as shown in the figure (a); the Ultrasonic probe installation circuit is as shown in figure (b). (View)
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Published:2011/5/30 1:29:00 Author:Christina | Keyword: sunshading board
The sunshading board circuit is as shown:
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Published:2011/5/29 9:05:00 Author:Christina | Keyword: Buick, trunk, back door, accelerator
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Published:2011/5/30 2:59:00 Author:Christina | Keyword: Transistors, internal circuits
The Transistors EMB11, UMB11N, EMB2, UMB2N internal circuits are as shown:
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Published:2011/5/30 5:10:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/30 5:09:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/30 5:08:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/28 0:51:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/28 0:28:00 Author:chopper | Keyword: crystal diode
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Published:2011/5/29 7:39:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/29 7:21:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/29 6:59:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/29 22:09:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/29 22:08:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/29 21:46:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/29 21:38:00 Author:chopper | Keyword: crystal diode, internal
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