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Index 257

Lithium ion battery charging circuit with M62253FP

Published:2011/4/13 3:12:00 Author:Nicole | Keyword: lithium ion battery, charging

Lithium ion battery charging circuit with M62253FP
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Useful USB interface lithium ion battery charger circuit(LTC4053 as controller)

Published:2011/4/13 3:18:00 Author:Nicole | Keyword: USB interface, lithium ion battery, charger, controller

Useful USB interface lithium ion battery charger circuit(LTC4053 as controller)
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5V、3A regulated power supply circuit composed of MPC1000 integrated regulator

Published:2011/4/13 3:34:00 Author:Nicole | Keyword: regulated power supply, integrated regulator

5V、3A regulated power supply circuit composed of MPC1000 integrated regulator
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28V、7A regulated power supply composed of MPC1000

Published:2011/4/13 3:35:00 Author:Nicole | Keyword: regulated power supply

28V、7A regulated power supply composed of MPC1000
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28V、10A regulated power supply composed of MPC1000

Published:2011/4/13 3:36:00 Author:Nicole | Keyword: regulated power supply

28V、10A regulated power supply composed of MPC1000
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Double-symmetry regulated power supply composed of RC4194TK, RC4194D

Published:2011/4/14 3:15:00 Author:Nicole | Keyword: regulated power supply

Double-symmetry regulated power supply composed of RC4194TK, RC4194D
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-10V、2A regulated power supply composed of SG52104

Published:2011/4/14 3:16:00 Author:Nicole | Keyword: regulated power supply

-10V、2A regulated power supply composed of SG52104
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Changeable bipolar regulated power supply composed of SG3501

Published:2011/4/14 3:19:00 Author:Nicole | Keyword: regulated power supply

Changeable bipolar regulated power supply composed of SG3501
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5V、10A regulated power supply composed of SN52105 integrated regulator

Published:2011/4/14 3:21:00 Author:Nicole | Keyword: regulated power supply, integrated regulator

5V、10A regulated power supply composed of SN52105 integrated regulator
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28V、1A regulated power supply composed of SN52105

Published:2011/4/14 3:22:00 Author:Nicole | Keyword: regulated power supply

28V、1A regulated power supply composed of SN52105
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15V、300mA regulated power supply composed of SN52105

Published:2011/4/14 3:23:00 Author:Nicole | Keyword: regulated power supply

15V、300mA regulated power supply composed of SN52105
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Discrete device multifunction charger schematic diagram

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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Symmetric steady voltage circuit

Published:2011/4/13 22:37:00 Author:Nicole | Keyword: symmetric steady voltage

Symmetric steady voltage circuit
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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LED tune indication circuit

Published:2011/4/7 23:06:00 Author:Nicole | Keyword: LED, tune indicating

LED tune indication circuit
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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The special linear regulated power supply composed of 7805，7905，7812

Published:2011/4/14 2:56:00 Author:Ecco | Keyword: linear power supply

The special linear regulated power supply composed of 7805，7905，7812
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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LED display TTL level circuit

Published:2011/4/6 22:42:00 Author:Nicole | Keyword: LED, TTL level

LED display TTL level circuit
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)