Audio circuit amplifier| DC speaker protection circuit explained Part I | ALPHA Lab

#ALPHA Lab #speakerprotectioncircuit #audiocircuit
DC speaker protection circuit explained Part I | ALPHA Lab
Hi friend!
In this video, I analyze the working principle of a speaker protection circuit.
The speaker protection circuit is helpful for the speaker and amplifier.
Watching the video test operation of this circuit, please:
• Project 4 | DIY the sp...
The power supply with speaker protector circuit
• Project 3| DIY the pow...
------------------------------------------------------
I hope my video is useful for you, please LIKE and SUBSCRIBE if you like it
Thank all
---------------------
Found this video useful? Buy Alpha Labs a coffee to say thanks: ☕
PayPal: www.paypal.me/alphalabs02
Fanpage: / alphalabsproject
Facebook group: / electronicprojects02
Email: [e-mail]

[@jerryluiz4813]

Perfect

[@vuabongtoi213]

Nice explain

[@columbioaudioskrishnamoort649]

Super explain 👌👌👌👌👌

[@victorsantanpagay5811]

nice explaination please add over current protection/overload protection

[@ALPHALabs02]

I will add them in another video. Thank

[@sylvanusleonard2717]

Wonderful explanation, I wish to point out a little error in the circuit. I think that the base of transistor Q2 should be connected to VCC and not ground otherwise when -ve d.c from the speaker is detected, Q2 emitter-base junction will not be forward biased and as such will not conduct.

[@ALPHALabs02]

Thank you.
Q3 conduct if detect +V and Q2 conduct if detect -V. So that base of Q2 should be connected to gnd

[@CommonPeople22]

I think the 220 resistor must be a power resistor, because when the input source meets the relay's inductor, it will feedback a power source back into the 220 ohm resistor, so 2 sources are placed into the 220 ohm resistor, it will be very hot and may burn.

[@ALPHALabs02]

Yes, it is a power resistor.

[@CommonPeople22]

​@@ALPHALabs02Thank you for responding

[@SpikeoutBattleStreet]

Does this circuit also protect against short circuit and overloading?

[@ALPHALabs02]

Friend, It doesn’t have short circuit and overloading function.

[@SpikeoutBattleStreet]

@@ALPHALabs02 Thanks for your reply.

[@nareshmahara4768]

which number transistor is used ?

[@ALPHALabs02]

You can use MPSA42 for npn and MPSA92 fo pnp or C1815/A1013 or other

[@sangitaguha6344]

How much ampere relay use for 200 watt amplifier?

[@ALPHALabs02]

Sorry, i'm later. It depends on how many watt in your load

[@souvicknaskar4538]

In your circuit you have used only NPN transistor so why you have mentioned NPN and PNP transistor both like MPSA92/MPSA42 ? Can I use only C1815 transistor in q1, q2 , q3

[@ALPHALabs02]

Yes. It only has NPN transistor. There is a problem in my memory. You can use MPSA42 or C1815 or another. The important is that you need to check its maximum current. An another important is that you need to understand how it work. Hope you like it.

[@souvicknaskar4538]

@@ALPHALabs02 thank you so much !

[@jonathanikechukwu3305]

How do I connect protect led indicator

[@ALPHALabs02]

From the C pin of transistor that control on/off relay, you connect a resistor series a red led to gnd. It is protection mode.

[@kasunabethunaga7676]

What Q1,Q2,Q3 number

[@ALPHALabs02]

In my design, I use MPSA42 and MPSA92 but you can use another transistors. Example 2SC1815, 2SA1013. Not difficult to chose transistor for those positions.

[@kasunabethunaga7676]

@@ALPHALabs02 thank you

[@malaimusic7772]

Hindi Laingvege sir

[@ALPHALabs02]

Thank feedback

[@huseyinsmk]

[DIY & REVIEW]: bitly.vn/555b link not working

[@ALPHALabs02]

Thank your feedback