This can also be used to test optocouplers. If the LED is flashing, the coupler works, if the LED is always off, the internal LED is bad (open circuit), and if the LED is always on, the internal light sensing transistor is shorted.
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Hello, the circuit in video will work with 12V? I need to put that with a switch on my motorcycle to know when the switch (wich control pit lane limiter ) is at ON position. Thank you Bro 😌
Also ich verstehe das das Funktionsprinzip dieser Schaltung nicht. Der Kondensator zb soll ja wohl das Blinken verursachen. Aber wieso sollte er das? Ein Kondensator wirkt als Zwischenspeicher für Spannung. Er sorgt zb dafür dass der Strom einer Schaltung weiterläuft wenn winzige Störungen diesen stoppen würden. In diesem Aufbau fungiert der Kondensator nach meinen Verständnis als Leitung. Wenn man den Strom abstellt zb. geht die LED nicht schlagartig aus sondern allmählich (wenn auch schnell). Wenn mir das jemand erklären kann wie das hier funktionieren soll wäre toll.
buenas tardes lo felicito por sus proyectos muy eficases para probar componentes,una pregunta tines entre tus proyectos algun probador de transistores npn y pnp una herramienta para ambos,espero su respesta gracias Douglas dsd Caracas Venezuela
A cheap option to replace my 555 with single use 9v battery. 4v rechargeable battery will be the logical reason. I'm still wondering why bc547 blinker only work above 12v
Because the two pins circuits uses Tr break voltage not gate. And this voltage is usually 8-12 on common transistors. You must use gate-based (three pins) circuit... but in that case the strobe effect is not so strong because bipolar(linear) transistors have some forward resistance. Adding high-power optorelay or mosfet (which have minimum Dss resistance, usually under 0.1Ohm and currents in amps or tens of amps) into the circuit as an effective power-output may solve this problem - and you can use it even for very high-power cobb diodes or other high-power outputs.
@@markangelosegurola Big resistor included as well. Increase value of charging resistor (5.6k) to at least 50k. It's gonna charge much slower, but there's some possibility that the optocoupler will drain the capacitor instead, not charging it up enough..
The circuit won't work without an LED or any loading resistor replacing said LED. The capacitor's voltage will quickly exceed the trigger voltage of 1.1V, which if not discharged through some load will overload and later destroy the coupling LED. Around 20 mA. Theoretically, this circuit can oscillate at over 10 kHz if you use a really tiny capacitor, but you won't be able to see that.
Bhai meain optocupler ic ke bare meain sikraha hu aur practical karke working dekna chatha hu tho bhai ap batha sakthe hain kya video meain jo optocupler ic hain uski input pin ke liye kithna value ka resistance chahiye
You can also change the value of the 5.6k charging resistor, but I don't recommend using anything smaller than 3.3k, as it can damage your optocoupler.
Are you sure? Yes, it will work with a simple diode and a normal transistor but I believe that the optocoupling adds some feedback/reaction to the effect. I don't have the means but maybe you could see the differences on an oscilloscope. ;)
Well it can, but optocouplers behave like relays, just solid state based. You need to apply a voltage (around 1V) to one side to get a closed circuit on the other. This makes it slightly easier to understand unlike transistors.
