Published:2011/4/13 3:12:00 Author:Nicole | Keyword: lithium ion battery, charging
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Published:2011/4/13 3:18:00 Author:Nicole | Keyword: USB interface, lithium ion battery, charger, controller
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Published:2011/4/13 3:34:00 Author:Nicole | Keyword: regulated power supply, integrated regulator
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Published:2011/4/13 3:35:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/13 3:36:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/14 3:15:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/14 3:16:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/14 3:19:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/14 3:21:00 Author:Nicole | Keyword: regulated power supply, integrated regulator
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Published:2011/4/14 3:22:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/14 3:23:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/13 22:55:00 Author:Nicole | Keyword: discrete device, multifunction charger
Discrete device multifunction charger is composed of reference voltage source, constant voltage and constant current source, voltage detection circuit, highest battery temperature, detection circuit and discharge circuit, as shown in the figure. (View)
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Published:2011/4/13 22:37:00 Author:Nicole | Keyword: symmetric steady voltage
Adopting butted amplitude limiter circuit composed of regulator tube, if you want to have symmetry, it needs two regulator tubes with same performance, such as this oscilloscope circuit, but it is hard to achieve in practice. So we can connect regulator tubes to rectifier DC circuit(figure a), output voltage UA is the sum of two diodes forward voltage drop UD2, UD5 or UD4, UD3 and regulator tube work voltage UZ. That is, +UA=UD2+UZ+UD5 or - UA=UD3+UZ+UD4. To select regulator tube work voltage and work point appropriately, it also can achieve temperature compensation for output voltage.
The figure (b) is large current amplitude limiter circuit. In the positive half cycle, the base-collector junction diode of transistor T1 is equal to diode D2 in figure(a), the base-emitter junction diode of T2 in series with diode D3 are equal to diode D5 in figure(a). (View)
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Published:2011/4/7 23:06:00 Author:Nicole | Keyword: LED, tune indicating
Connecting a LED to each endpoint of tune disk. If one of LEDs turns on, tune indication will depart from it and remove, when two LEDs are all off, it will move to dead point, then it can obtain true tuning point.
The advantage of this tuner is minimum current consumption, even using a very weak LED, it also can indicate tiny mistaken tuning. To adjust VR1, broaden tuning point zone enough, then LED will not flashing because of the loud language or music. (View)
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Published:2011/4/14 2:56:00 Author:Ecco | Keyword: linear power supply
As the chart shown: it's a special power supply circuit. The circuit is simple, but it can generate three sets of DC voltagethe by two same secondary windings: +5 V,-5V and +12 V. Its characteristics are: D2, D3 are crossing over the two AC power groups E2 and E3, to play the role of full-wave rectifier.
(View)
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Published:2011/4/6 22:42:00 Author:Nicole | Keyword: LED, TTL level
When there is no cathode ray oscillograph, you can use this circuit to observe TTL level. 74123 integrated circuit contains two retrigger monostable multivibrators with reset input terminals, they are marked for A1 and A2. When the input level changes, LED is lighted up by two monostable multivibrators. Because monostable delays pulse width, so, even the input pulse is narrow, the naked eye still can distinguish the light and dark change of LED. The attached list explains the meaning of three LEDS in various point. (View)
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Published:2011/4/13 3:39:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/13 3:41:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/13 3:44:00 Author:Nicole | Keyword: regulated power supply, computer
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Published:2011/4/14 2:32:00 Author:Nicole | Keyword: AC purification, regulated power supply
AC purification regulated power supply circuit (View)
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