One rapid LED light pulse per press of push button switch circuit using 2N3904 NPN BJT
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- čas přidán 7. 09. 2024
- PNP version circuit • PNP BJT one rapid LED ...
Another demo of resistors on both side of capacitor • Sometimes either a par...
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PNP version circuit czcams.com/video/Gb-lICO9SbI/video.html
Another demo of resistors on both side of capacitor czcams.com/video/KzO3ikVioks/video.html
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Thank you so much, it took me hours to find this circuit. I kept bumping onto PWM circuits and Arduino, stupid power like 24V or using unijonction transistors... I started to really get mad.
Glad it helped, thanks for watching!
Thank you very much.
Thanks for watching!
GREAT VIDEO!!!........one thing though...
At 1:39 the 100k resistors are in parallel. so it's actually 50k discharge...not a 200k discharge.
When the switch is closed and the capacitor is charging, those 2 resistor are somewhat in parallel until the capacitor is fully charged charge. Technically resistors aren't truly in parallel unless the same voltage is across them and no other components are in series with one or the other. The capacitor and Base Resistor together are parallel to the low side voltage divider resistor while the switch is closed (on). Once the capacitor gets charged to the maximum voltage that can be applied to it, then no current will flow through the base to ground resistor but will keep flowing through the low side voltage divider resistor. Opening the switch (turning it off) will make the capacitor the only power source for the 2 resistors that it has headed to ground, until it is fully discharged. Ground is not part of the power for those 2 resistors while the capacitor is discharging, it's just a half way point between the resistors. So, the same current has to flow through one resistor, and then through the other resistor from one side of the capacitor, to the other. Resistors are only in parallel when the exact same voltage is directly across both of them, so that each one of them creates a separate current path through them, that can not be affected by the other one.
I use PN2222 transistor maximum time to experiment with different circuit...... Actually last month I have perched 30 different values 50 each (pn2222 100 pcs extra) transistors...
I ❤️ ur all videos and
I ❤️ 2222....
Could you show this circuit on the scope?
Sir, i have problem with this. I use 2 white led and 2 red led (3mm size), the white led won't light up, only the red led will light up because the difference in specs between the red and white leds. If i give resistor to the red light then the white light will come on but it will be dim (not bright) and of course the red light will also be dim. I use input 4.2 volt. Can you give me solution? Thank you.
Using a 4V to 5V power supply, you can only wire white LEDs in parallel. And all parallel LEDs should have their own resistor. LEDs drop voltage, and white LEDs drop about 3V. So if you put them then series, then they will drop 6V. A white and red LED in series will drop about 5V because red LEDs drop about 2V each.
@@Electronzap I cannot use power supply 5V because i use 1 cell lipo battery (fully charge at 4,2V). Okay i will try paralel with resistor. Thank you for your reply sir 😉👍
What capacitor and resistor should I use when using a 9V battery?"
hey! I am from India 🇮🇳 and loved your circuit can you please make it for 3.7v L-ion battery and explain the circuit!
Niceee like ever!
Thanks!
hi, why need the bottom two 100k resistors?
They let the capacitor discharge through them. But they can't be allowed to have current flow through the base of the transistor. So they both have to be connected to ground so that when the switch is closed, current can go to ground through the bottom resistor to ground, instead of working it's way to the base, which is what would happen if you simply gave the capacitor a parallel resistor to discharge it.