Monday, December 9, 2013
LM3909 using 1.5V Battery or 3V Monitor circuits
We come to add LED Flasher for Monitor the electric current of
battery 1.5V and 3V. By use the integrated circuit LED Flasher or
Oscillator. By the rate something flasher equal to 2V. This circuit
eats electric a little current poor age the work of battery long
can’t be like be usable. If friends use battery 3V as a result
liberate pin 1 float keep. I hope that a friend may apply with
Battery 1.5V or 3V Monitor Circuit
LM334 using Voltage Reference Circuits.
This Voltage Reference Circuit. It used LM334 (ADJUSTABLE CURRENT SOURCES IC)
By fix the trend is stable. It make the pressure that pay to come out have tall stability. By can fine decorate VR1 10K Adjust Voltage Output. And You can use Voltage Input power supply at +2.5V to +20V. cause be high class voltage Output be valuable 0.8-5.0V depend on fining decorates VR1 there.
By fix the trend is stable. It make the pressure that pay to come out have tall stability. By can fine decorate VR1 10K Adjust Voltage Output. And You can use Voltage Input power supply at +2.5V to +20V. cause be high class voltage Output be valuable 0.8-5.0V depend on fining decorates VR1 there.
Wednesday, December 4, 2013
2N4851 Using 12V Battery charger Circuit
This is an automatic 12V battery charger circuit, they uses the power SCR and UJT are main parts.
And they will not work except the battery 12V to be charged with right polarity, so prevent errors as well. The battery voltage controls the charger and when the battery is fully charged, the charger will not supply current to the battery anymore.
The battery charging current through the SCR MCR3818, when it is triggered into the conducting state by the UJT 2N4851 relaxation oscillator. And the oscillator is only activated when the battery voltage is low. Vb2b1 of the UJT derive the battery voltage that to be charged, and since Vp = Vd = Vb2b1 ; the higher Vb2b1, the higher Vp. When Vp exceeds the breakdown voltage of the zener diode ZD1, the UJT will stop to work and the SCR1 will not conduct.
T1 =Primary – 30 turn #22 , Secondary – 45 turns #22
R1 = Series resistance to limit current through SCR so use MCR3818 at 20 amps.
The setting VR1, we can charge the battery as needed. Electronics Circuit Application
And they will not work except the battery 12V to be charged with right polarity, so prevent errors as well. The battery voltage controls the charger and when the battery is fully charged, the charger will not supply current to the battery anymore.
The battery charging current through the SCR MCR3818, when it is triggered into the conducting state by the UJT 2N4851 relaxation oscillator. And the oscillator is only activated when the battery voltage is low. Vb2b1 of the UJT derive the battery voltage that to be charged, and since Vp = Vd = Vb2b1 ; the higher Vb2b1, the higher Vp. When Vp exceeds the breakdown voltage of the zener diode ZD1, the UJT will stop to work and the SCR1 will not conduct.
T1 =Primary – 30 turn #22 , Secondary – 45 turns #22
R1 = Series resistance to limit current through SCR so use MCR3818 at 20 amps.
The setting VR1, we can charge the battery as needed. Electronics Circuit Application
Tuesday, December 3, 2013
M7555 - Battery Status Monitor circuit
The low power LED flasher by ICM7555
Normally, when you need to use LED display status of the battery 6V-12V. Just add a resistor in series only. It is easy and saving.
But not cool and consumes more power.
- The impression of a bright that continuously. I think that did not noticeable it.
- When the LED light as well So consumes too much energy. Although the LED need voltage is 1.8V only, but it uses too current is 15mA-20mA.
A wise choice.
- The LED flashes very prominent.
- Find out how to use current less than 1mA. When several ten years ago. I’ve used a LM3909 of LED Flasher/Oscillator IC.It is built for a particular flashing light or low current led flasher so easy to make and includes a very small amount. But unfortunately. Now IC manufacturers stopped producing it.
But we also have the option of interest, may be better than. If you are familiar with the IC 555 is a relative of the family is ICM7555 (or 7555IPA) with the same features. However very low power consumption. Because the internal structure of CMOS, So works great.
You take a look that the circuit is easy like I said or not. As shown below. You see not wrong, it using only three pieces, it can make the LED to flashes. By pull current from the power supply is only 0.15mA. It is designed as a typical Stable multivibrators circuit. (If you do not understand see this web. We have several circuits)
Special! In normal circuit, the capacitor will discharge directly to
ground. However, for this circuit, the capacitor is discharged through
LED1, so that LED1 flashes intermittently.
Just this you have a simple battery monitor circuit by IPM7555 Some people would say that’s not worth it. This circuit is more expensive than the old method. However it can extend battery life by several times, or Adapted for low current power supply such as solar or other alternative energy sources. They result is the same. Electronics Circuit Application
Normally, when you need to use LED display status of the battery 6V-12V. Just add a resistor in series only. It is easy and saving.
But not cool and consumes more power.
- The impression of a bright that continuously. I think that did not noticeable it.
- When the LED light as well So consumes too much energy. Although the LED need voltage is 1.8V only, but it uses too current is 15mA-20mA.
A wise choice.
- The LED flashes very prominent.
- Find out how to use current less than 1mA. When several ten years ago. I’ve used a LM3909 of LED Flasher/Oscillator IC.It is built for a particular flashing light or low current led flasher so easy to make and includes a very small amount. But unfortunately. Now IC manufacturers stopped producing it.
But we also have the option of interest, may be better than. If you are familiar with the IC 555 is a relative of the family is ICM7555 (or 7555IPA) with the same features. However very low power consumption. Because the internal structure of CMOS, So works great.
You take a look that the circuit is easy like I said or not. As shown below. You see not wrong, it using only three pieces, it can make the LED to flashes. By pull current from the power supply is only 0.15mA. It is designed as a typical Stable multivibrators circuit. (If you do not understand see this web. We have several circuits)
Just this you have a simple battery monitor circuit by IPM7555 Some people would say that’s not worth it. This circuit is more expensive than the old method. However it can extend battery life by several times, or Adapted for low current power supply such as solar or other alternative energy sources. They result is the same. Electronics Circuit Application
Monday, December 2, 2013
Car brake lights by BC327 Circuits
his is the circuit add beauty to the brake lights of the car. With a
display of 14 LEDs, visible clearly, for safety and beautiful. The
installation format can fix by oneself as you like it.
This circuit use the astable multivibrator for generate a oscillate frequency so all LED flashing.
The working of the circuits
When enter the light brake voltage, makes have power supply 12V come in cause LED6-LED9 glow or On. Besides the trend will flow to change R2 go to bias pin base of Q1-BC327 PNP transistor and Q2-BC327, causes LED1-LED5 and LED11-LED14 the bright up. Which there are R1 and R3 help to limit a current that flow through LEDs enough liberate brake power supply 12V disappear make LED every switch off.
parst list
Q1,Q2_______________BC327____50V 1A PNP transistorrs
LED1-LED14__________LED display as you want.
R1,R4_______________22 ohms 0.5 watts 5% resistors
R2__________________390 ohms_0.5 watts 5% resistors
R3__________________500 ohms__0.5 watts 5% resistors Electronics Circuit Application
This circuit use the astable multivibrator for generate a oscillate frequency so all LED flashing.
The working of the circuits
When enter the light brake voltage, makes have power supply 12V come in cause LED6-LED9 glow or On. Besides the trend will flow to change R2 go to bias pin base of Q1-BC327 PNP transistor and Q2-BC327, causes LED1-LED5 and LED11-LED14 the bright up. Which there are R1 and R3 help to limit a current that flow through LEDs enough liberate brake power supply 12V disappear make LED every switch off.
parst list
Q1,Q2_______________BC327____50V 1A PNP transistorrs
LED1-LED14__________LED display as you want.
R1,R4_______________22 ohms 0.5 watts 5% resistors
R2__________________390 ohms_0.5 watts 5% resistors
R3__________________500 ohms__0.5 watts 5% resistors Electronics Circuit Application
Amplifier speakers delay circuits
This circuit is small-sized circuit at can build easy, and usable get
easy between a loudspeaker with amplifier. By have relay be switch edit
during opening-time switch that stereo will hear the sound “Tlub” come
out from loudspeaker. Which this sound is sound the electricity will
pull sharply to flow enter still a loudspeaker and may will make a
loudspeaker can are damaged therefore then necessary to must have time
drag while open switch for a moment. For speak this part disappear
before then build enter still a loudspeaker.
When receive power supply come in, The C1 will charge thereafter C2
begin charge change R1. When C2 charge full until go to bias give Q1
work go to current driver give relay. Which use relay model double
contract, make contract switch touch. From that time build a
loudspeaker suits power amplifier the period will delay to depend on the
value C2. If want to give can delay long ago enhance the value C2. But
if give can delay short down devalue C2.
Now, You do want to make this project. Electronics Circuit Application
Now, You do want to make this project. Electronics Circuit Application
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