Published:2011/4/21 20:19:00 Author:Robert | Keyword: Multi-Control, Four Switch
Multi-ControlFour Switch Circuit is shown below:
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Published:2011/4/21 8:01:00 Author:Robert | Keyword: Adjustable Offset Voltage
INA103 Adjustable Offset Voltage Circuit is shown below:
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Published:2011/4/21 4:34:00 Author:Nicole | Keyword: Microcomputer system, integrated chip, power supply monitoring
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Published:2011/4/21 4:04:00 Author:Nicole | Keyword: regulated power supply, overvoltage protection
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Published:2011/4/21 4:27:00 Author:Nicole | Keyword: regulated power supply, transformer
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Published:2011/4/21 4:28:00 Author:Nicole | Keyword: Walkman, external power, AC noise
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Published:2011/4/21 3:56:00 Author:Nicole | Keyword: switch power supply, charger
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Published:2011/4/21 4:37:00 Author:Nicole | Keyword: regulated power supply
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Published:2011/4/21 4:39:00 Author:Nicole | Keyword: mobile phone battery, charger
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Published:2011/4/21 4:40:00 Author:Nicole | Keyword: mobile phone battery, charger
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Published:2011/3/30 22:12:00 Author:Ecco | Keyword: most simple, most practical, switching
Simple switching supply circuit diagram with a triode:
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Published:2011/3/30 22:48:00 Author:Ecco | Keyword: photocoupler, High voltage , stabilized voltage
The circuitry is shown as chart. The drive tube need to adopt a transistor which can bear higher pressure(the drive tube is 3DG27). When output voltage enlarges, the bias of V55 raises, the forwarddirection current of the light-emitted diode in B5 will rise, and the voltage in the electrode of photosensitive tube minishes, the bias of regulator tube decreases while the internal resistance increses, then make the output voltage stable. (View)
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Published:2011/4/21 1:20:00 Author:Nicole | Keyword: Ni-Cd storage battery, charging equipment
This automatical charging equipment can ensure the storage battery has a good process of charging, it also can prevent overload. It has three charging methods: standard charging, sustainable(microflow )charging and fast charging, they have differences in charging current and cuting the process of charging.
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Published:2011/3/30 23:22:00 Author:Ecco | Keyword: rear-projection TV
TOSHIBA AG series rear-projection TV supply circuit diagram is as below:
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Published:2011/4/13 9:18:00 Author:Nicole | Keyword: photoelectricity logic circuit
Q1, Q2 phototransistor is illuminated about 1076.4 lx(100feet one candle), Q3 output is zero. When a or two phototransistors is no illumination, Q3 output is positive or 1.
This circuit can be used as electro-optical logic exciter of power device. (View)
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Published:2011/4/14 6:46:00 Author:may | Keyword: 6.5V, reference power supply
This circuit can make DC voltage UV always stay at about 6.5V and has no reference to time and environmental temperature. Its main technical data:
Steady output voltage: UN=6.5±5% V
Output load current: IL=0~0.3mA
Input voltage (supply voltage) : U1=19~54V
Input current Ii (stable current Ia) : Ii=Ia≈2mA
Output resistor: dUN/dIN=r0=20Ω, maximum 50Ω
Voltage-regulation coefficient: dUN/dUI=a=3×10-6, maximum 3×10-5
When the range of environmental temperature is 0~70℃, the average temperature coefficient of reference voltage: SAV=-100~+140μV/grd, typical value +67μV/grd
Long term stability after working 100 hours: <1mV/1000 work hour
Environmental temperature: θu=0~70℃
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Published:2011/4/20 1:17:00 Author:muriel | Keyword: 100v, 10mA, regulated voltage power supply circuit
Thecircuit has two functions that areno-load protection and shorttime short-circuit protection. If you want to allow short-circuit fora long time, it must increase the PCM of theresistance R1 and R2, such as R1=1.2KΩ, 20W; R2=220Ω, 4W.
The main technical data:
output voltage:U2=100V
output current:I2=10mA
input voltage:U1=120V~180V
Radiator thermal resistance:Rthk=20grd/W
output voltage variable quantity:
When input voltage U1=120V~180V and nominal load, ΔU2=1V
When input voltage U1=120V~180V andno-load, ΔU2=1.5V
When output current I2=0mA~10mA (U1=constant), ΔU2=1.5V
ambient temperature θu=0°C~60°C, ΔU2=150mV/grd
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Published:2011/4/19 4:02:00 Author:May | Keyword: Frequency modulation, switching, stabilized voltage supply
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Published:2011/4/14 6:44:00 Author:may | Keyword: Reference voltage source, complementary transistors
The characteristic of this circuit is shown in the following table ( RL=68kΩ)
reference voltage source
adopts BJT
adopts complementray transistor
voltage-regulation coefficient △U2/U1 ( enviromental termeprature θu=20 ℃)
1.2×10-4
4×10-5
variation of voltage reference △U2[when △U1/U1=(20±10)% and θu=20℃]
520μV
180μV
variation of voltage reference when the temperature rise from 20℃ to 100℃
9.6mV
10.8mV
output resistor
<15Ω
input rated voltage U1
22V
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Published:2011/4/14 4:38:00 Author:may | Keyword: Reference voltage source, operational amplifier
The features of this circuit:
1 operational amplifier will not cause drift, voltage regulator tube have thecharacteristic of temperature compensation
2 the output voltage of pin 3 is very low, so, output current must higher than 10mA, it has no influence to voltage regulator performance and drift characteristic
3 choosing appropriately among R1、R2 and R4 can make the output voltage has a wider range (U3>U2) . (View)
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