Light Bulb Flasher Without Transistors Using Just a Relay [DIY]

How to make a light bulb flasher (or LED flasher) without any transistors. Really simple circuit.
To make this device you will need:
1. 12V relay
2. 2200uF capacitor
3. 100 Ohms resistor.
4. 12V power source (battery or a DC Power supply).
In addition, you may also need 10 Ohms resistor and 470uF - 1000uF capacitor if it doesn’t work without it.

[@ohmultiverse]

This circuit is absolutely perfect as a step in TEACHING electronics. After giving kids a solid understanding of Ohm's Law, then capacitors and the r-c time constant, this is the PERFECT circuit to put all that knowledge together. Step back, point to the flashing light, and you can say to the kids "Now think about it...you totally understand what's going on here. When we started learning, you would have had absolutely no idea."

[@JsBekkr]

easy to follow instructions as long as you pause it here and there. Finally I was able to understand this analog flasher circuit thank you

[@redlinemadman9054]

Awesome! Just built this circut and it works! (Running on 18v (2 9v batteries)) also, used a resistor for the light

[@francescobernini4479]

Fantastic, works really well.

[@astronic4522]

Nice project brothers👍🔔🙏 5:07

[@jonathanbrierley8304]

great circuit - how would you scale it down to a 1.5v application?

[@Edmorbus]

Nice video

[@user-zd6rf2qi1i]

Positive point of cap on positive point on relay and same for negative?

[@bluepen215]

Good 👍

[@user-vb4ic4wn7p]

Muy interesante

[@Chicole2708]

Tengo el mismo Capacitor, pero le puse una Resistencia de 220 ohms, y no me anda que sera?

[@mapero2010]

Muy bueno. faltaria agregar el calculo de tiempos

[@traveller4750]

1000 uf capaciter using few minutes flasher working after 10 minute not blinking
Why not blink give the reason

[@traveller4750]

Why using resister

[@omarsalah4519]

why it does not work on proteus ?!

[@ericktandas6588]

I think you don't need the extra cap and resistor. the problem is in power source the first one better use with led. The second one the battery you use both led add higher watt valve

[@ErkanOkman]

👍👏

[@ramess_s]

It works with two bulbs?

[@ElectricalPro]

Yes, you can connect two light bulbs.

[@neoris7833]

resistor wrong point relay terminal!!!

[@_ayushman_jena_9413]

Not working 😢

[@bluepen215]

Small capitor more the spedd of flashing

[@fat5687]

masyadong mabusisi... may mas simpleng paraan jan na no need na nh caps at 1 resistor lang need mo mas stable ung diagram n un

[@fat5687]

pti ang word na "chanel" di mabigkas ng ayos.. 😢😢😢