This principle was used by Nikola Tesla, in his Tesla oscillator. His relay generated inductive impulses when opening the circuit. These impulses then flowed through a series resonant primary coil. The series resonant primary coil/cap, was placed where the lamp is in this video, with the capacitor on the switch side. The circuit can be found in the August 1919 Electrical Experimenter article

Am facut acest oscilator si functioneaza bine cu bec/12V si c=4700mF.Am inlocuit becul cu bagheta cu 3 leduri/12V si c=2200mF.Merge foarte bine cu un releu auto 12V/30A (alt releu nu am avut).Am montat un comutator intre borna 87a si borna minus.

This brought back memories from years ago when I used 6 cell phone batteries in series to a flasher relay with a fog light for a distraction. I always tell people if your blinker is blinking faster or slower than normal, check your lights cause one is out.

Your such a great man .Your unselfish sharing true knowledge about science will leave a legacy to all youtube user.I wish I could be like you.

Jamás pensé que se podía usar solo un relay para hacer un oscilador!!! ahora sé como funcionan las luces direccionales y de peligro de los autos!!! sin ninguna electrónica adicional! Muy buen video!

Simple concise explanation of a useful circuit. Excellent commentry and excellent teaching material.

Nice video. Very simple, easy to follow and understand. No annoying music.

you are one of the best youtube electronics channels ever! you explain everything so easily, you deserve my sub and like!

An excellent presentation; very clear; i like the accent; and the way that you add different components helps identify what the components do; and the effect that they have on the circuit…very nice…...

Thanks. Very well explained. I wonder how and why other videos get higher number of views when the don't even explain anything..

Those are the secret switch for inverters and UPS electronics controls. Relay switches as oscillators for higher currents are commonly used aside from mosfets switches which usually breaks easily when it is over used. I used that to amplify my weak Wi-Fi signal too because it creates additional broadcasting of frequency that is using only 6 volts D. C. Batteries.

I made this when I was 12 years old....... Great work........

Same principal as the old multivibrator tube (not really a tube, just used an octal base tube socket) found in old, pre 1950 car radios that used tube (valves for UK terms) and portable military radios, before transistor circuits became available. You could use this method to supply a DC pulse, to a step up transformer, to develop higher voltages. You could change the capacitor value, to adjust the duty cycle, or, frequency, to avoid spurious RF interference, to broadcast band radio receivers.

So a higher capacitance cap will lower the frequency and low capacitance will charger faster and increase frequency. Thank you for the info.

so nice explanation , now i just know how the flasher light in cars is working

Unusually simple and very elegant!

EXCELLENT!!!! Extremely well explained. Totally easy to understand, wich is the result of a perfectly clear teaching! 2 thumbs up!!

Thank you my friend. I learn from you. Congratulations.

Very nice video, thank you! I have a 12v relay that I want to use to drive an ignition coil, now I know how to wire it from a battery.

i wasted so much time wondering how dc converted into ac using relay.. finally i understand it by your video..

Sorry for late comment, but this Video is very well explained 👍🙂.

The frequency depends on an RC oscillator, where your load is your resistor.

Thank you for showing simply how the relay oscillator works. You have done a good job. I appreciate it. If you have a reliable 24/7 AC electric source or a set of large capacity 12V batteries I'd be interested in knowing how long the relay runs at the last frequency shown, with the incandescent lamp, before it fails.

Put a pulse counting device at the end of the oscillator and you then can measure the number of cycles the relay endures before wearing out!

so simple , yet it is very interesting. already got my AA in electronics too.

Great ... !!! ... This circuit is very usefulll ... We can make a relay too ... We can use a diode for to eliminate the coil inverse voltage... This voltage can be kill capacitor or others components used for other purposes ... Thanks a lot ... !!! ... ~rr*

Thanks man I'm always wondering how could you make it so simple like that God bless you

Your videos are so good. Ludic Science for President!.

Unfortunately, the flash can only be made low frequency ( visible flashing which is not too fast) by certain relay with high remanence

Bells works the same way. However they don't need a capacitor. 4:02 Not just 2 things, there are more things like voltage you apply and resistance of the relay coil. I bet that the higher the voltage the lower the freuency. Same with coil resistance, the higher resistance the lower the frequency as coil draws less current from cap.

Soy de mexico d.f MUCHAS GRACIAS. BONITO VIDEO. GRACIAS.

I have replicated this and it works nicely, i am going to use this to relace my car's flasher relay. Thank you very much.

Mr claudiomar Santos ! Thanks for your advice regarding to put diode inorder yo eliminate the relays coil divers. I will be thankful if you explaine exactly what kind of diode and diagram. Very thankful.🙏

Hello, Can you tell me the frequency range of the coil/relay? Also can you connect a tuning capacitor into this circuit? Thank you very much. Great video

thanks a lot. You answered my question in this video

On the relay type vibrator, why did you not use relay with other sets of contacts to keep the load bulbs separate ? There is an on/off duty cycle.

Simply Out Standing Sir

First step to automatic plasma rifle, thanks

Good Explained

Awesome demo

can i use this relay to simulate a switching on power booster that ur make earlier?

so simple yet very effective. such a nice tutorial. hope you'll do more. keep it up 👍 🙌 just a question, what is the formula that controls the frequency of the oscillation including the current of the load.?

Excellent video. Very well explained. Thank you.

Thank you very much ❤❤

it is a genial simple video. gracias.

Nice video, does this need flyback diode or not? Thanks

Cool Video....I Did Not No That You Could Do That With A Simple Relay

Hey. Great explanation. What happens if you connect the light between the NO of the relay and ground instead of VCC?

Hola!, bonito video, pero tengo un par de dudas. Se puede (O conoces) medir la frecuencia que consigues con este circuito? (Dudo que las partes mecanicas internas superen el rango de kHz), podrías explicarme? La otra pregunta es si con este dispositivo (Suponiendo que entrega una frecuencia alta) se podría manejar un flyback?, es decir, usar 2 relés, uno que oscile la bobina del segundo relé y ese mismo entregue un voltaje alternado a la bobina primaria del flyback.

Maybe a stupid question from a starting electronics student, but if the cap is in parallel with the coil then the relay doesn't have to wait for the cap to charge right? Where is my mistake?

that is exactly what i am looking for ! thank you for sharing !

I've made something similar to, but with coil and wire connection. it buzzed.

Hi manuel, Great Explication, i follow you in you another channel.

Best explanation thank you

Really nice video...I guess this is how the turning indicator on cars work?

He invented the turn signal.

I can't remember if I got shocked by it but, the logics are: the coil gets a build up with electromagnetic field, then the electromagnetic field discharges when the switch is opened, when it discharges, the discharge generates a high voltage, and that high voltage is hazardous to your health.

What's the direction of current flowing through the bulb , coil, and cap during charging and discharging?.

thanks man! just tried it ! works awesome

Can I use the same battery for both outputs on the relay for 2 different circuits? I did this but the relay keeps clicking. It can't stay on.

May I ask on how to calculate the time when would the bulb would blink given there's a specific number of blinks given in a minute and the number of blinks per minute in this kind of circuit? There's probably a formula that I haven't heard of when using with the relay setup. We were asked to create a set up that had three modes: 5 blinks per minute, 10 blinks per minute and 20 blinks per minute with the same setup (using relays)... Hoping for your response!!

can i use this for a transformer or a boost converter?

Hey! Very nice video. I'd appreciate if you could clarify something for me here :) How long cap takes to charge compared with coil to energize? Is that an order of magnitude? I mean, cap needs time to charge before it can power the coil, and the power cuts as soon as coil pulls the switch; so is it like cap charges faster then coil energizes? And how long that relay survived that abuse? Thanks!

is there a formula to calculate frequency ? what values to gibe 7.8 Hz oscillation ?

I've done this. The relay lives a minute or so before it dies, lol.

Hello sir I was wondering can relay oscilator be replacment for ignition module? I have problems to tune me engine at low speed so I was wondering can blinker relay act as ignitor for ignition coil? I have hard time to figure out how me E core GM hei coil is wired I do not understand the wire lay out for that coil. Im looking for some thing similar like the old jaguar ignition system they hade dual ignition coils but I have problem the jaguar distributor hade 2 pick up coils so I dont know how I can trigger 2x gm 4 pin ignition modules so any advice how I can manage this problem? Aperantly the ignition coil by jaguar wad called auxulery coil it reduced resistance in primary ignition coil so they simply wound ignition coil in series and simply pluget that high voltage side with cap. They also used 4 pin gm ignition amplifier with zener diode and condensor so I can buy those necesary components but still I have problem with me pick up coil shuld I wound second wire in the existing pick up coil ore are there exist transformers ore inductors that can make 2 pulses to 4 pulses? So any help please how to solve this problem?

I cannot understand why does 5v relay have 3 contacts for the coil -- 5v, GNВ and Signal. Please explain it.

Could you try placing a diode across the coil to see what happens?

Is there anyway to control when the oscillator is triggered. I know you may not even need the oscillator but i'm trying to come up with a capacitor "relay" where I have multiple capacitor banks connected and I need it to be like for example: There is 2 capacitor banks, 1 is discharged and 1 is being charged to be discharged, after that one is discharged, the other one discharges. Sorry if its confusing, any help will be appreciated thanks.

Now i know how the *S I G N A L L I G H T S F O R C A R* works. Thanks!

Thank you very much for this. I spent hours reading about oscillators and you explained it better in 5 minutes. Subscribed. Anyone know if there's a formula to figure out the frequency? Assuming it would be based on voltage, load R, and capacitance. Thanks

Simple is brilliant no doubt, you are a great explainer my friend. Im still very basic when it comes to electronics. Can you help me in calculating how to obtain 30Khz , out of a high voltage coil and core 9KV at 30mah transformer? My schematic calls for a capacitor and resistor in parallel discharging on a coil inductor that will transmit the signal , thx!!

If you placed an ignition coil in place of the lamp, would that put out a dc voltage at the high output of the ignition coil?

What do you mean by coolant? The the frequency of oscillation depends on the 1. capacitance of the capacitor and 2. the coolant?

Enjoyed the video. Good Job.

this works but it is really hard on a battery or a power supply...it will kill it very fast...each time it pulse's...if you have the light bulb in the circuit..

I got it to work...nice video...

The relay can last longer if you measure the resistance of the internal coil of the relay and, then just don´t use nothing that consumes more then that resistance, or it will kill it.. Example; if the coil has a resistance (X) the current going through the lamp should not be grater than that (x) value. Else, the coil inside the relay heats up and burns.

That looks like how an automotive light flasher functions.

47 uF looks about right in the video?

So for this to work you have to have a relay with always closed... right ?

What the componets did u use plz ?size of Relay and battery plz

So good and knowledgeable.

Nice work!

Good project I like it

you saved my life again :D

No doubt working project

Very fine video, but at the end you say something wrong, I think. With higher Amperage of the lamp, the frequency does not drop. The frequency gets higher, because the capacitor deloads faster.

I need a high speed switching of 50 kHz ....what type of relay or switch u recommend and what would I need. I am new to this stuff

Couldn't you make it frequency-independent by taking a multi-switch-relay ? So you would build a separate circuit, where you can put on your load... You just use another contact "pair", but you wire it, so that the current comes from example of your battery?

Can I place a transformer in place of the lamp to make a step up transformer?

What is the value of the relay, capacitor and led? Pls reply

Grato! Parabéns!

How much microfares does that capacitor have

Well done...!

what is the value of capacitor and what type of relay is used in the project ?

But one thing is I didn't know what the capacitor value you used

therefore the speed of a frequency is depend on value of capacitor

That was a perfect delay .. I looked everywhere for a flashing led circuit but the timing was always too fast.

Well Explained Sir