Hi my dear friends. Many of you asked me to show how to make a mini portable speaker for tablet, laptop or cell-phone. So in today’s video I’ll show you ho to make the simplest sound intensifier. It’s the simplest one, because it’s up to everyone to make it, even to a schoolboy. Its scheme consists of the simplest components. In today’s video I’ll just how you how to make a sound intensifier, we’ll test it and if it works, in the next video I’ll show you how to make a speaker. We’ll make a body for the sound intensifier and insert a dynamic, I hope you’ll like it.
Let me tell what we need to make such a sound intensifier, and then we’ll start the work. First, we need a connector for a crown, the crown for 9 volt, one dynamic for 0,5-1 W and with the resistance of 8 Ohm. We also need one mini jack for 3,5 mm, one resistor for 10 Ohm, a switch, LM386 microcircuit chip and one condenser for 10 V and 220 mF.
To make it easier to explain you the scheme, I’ve drawn it on the sheet of paper.
Now I’m going to zoom the picture and explain you all in details. As you might see this microcircuit contains four pawls at each side, there are 8 pawls in total. In order not to be confused and not to turn the microcircuit upside down and solder in a wrong way, there’s kind of semicircle on a microcircuit, such a mark. You need to put this mark upwards.
Let’s start soldering everything step by step. You might notice that number 6 is a next-to-last on the right, we solder one wire to it.
Then this wire should be linked to a switch, so we solder the wire to the switch.
The second contact from the switch should be linked with the plus of the crown connector.
The first stage is done. I’m going to tell you what we did. We have soldered a wire from the 6 contact through the switch – here is it on the scheme, to the plus from the crown connector. Here is the connector.
We move to the next stage. Contact number 5, which is the last one on the right, to which we link a condenser. There are both plus and minus in the condenser. So how are we supposed to identify them? There is a zero on a black stripe – this is the minus, another side is the plus. According to the scheme we connect the plus with the last contact on the right. Here is the plus, I’m going to shorten it a bit.
So we have soldered the condenser. Let’s move ahead. There is the minus left from the condenser, which we have to solder to the plus of the dynamic. Look for the plus of the dynamic. Here it is. Solder the minus of the condenser to the plus of the dynamic. In order not to solder dynamic to condenser at once, we are going to take a wire and lengthen it. Now solder a wire of the condenser minus to the dynamic plus.
Then, link the minus of the dynamic to the 4th and 2th pawls of the microcircuit. First, to the minus of the dynamic
then solder this wire to the 4th pawl on the right side of the microcircuit.
We have to solder the same wire to the second pawl of the microcircuit, to do it we are going to make a small bridge.
Then, we have to connect resistor to the 3d pawl on the left side of the microcircuit.
Solder a wire, which is the plus from the mini jack to the second pawl of the resistor. Take a mini jack to pieces, you might see there two contacts for the left and right channels. Connect them together and solder a red wire we have lengthened the wire of the resistor.
The minus of mini jack should be soldered to the minus of the speaker.
Finally, we just have to solder the minus of the crown connector to the minus of the speaker. So we take a wire and solder to the minus of the speaker.
That’s all. It’s very easily. You might have noticed that it took 5-10 minutes. Let me explain all the procedure step by step for you to understand. Number 6 goes through the switch to the plus of the crown.
Here is the switch, the wire linked to the switch and then goes to the plus of the crown connector. That’s right. Then number 5, which is goes through the plus of the condenser, here it is, then there is the minus that is connected to the plus of the dynamic. Here is the plus of the dynamic, that’s right. The minus of the dynamic is linked to the 4th and 2d contacts, that is ok. The 3d contact is linked through the resistor to the mini jack. Here is the resistor which is connected to the left and right channels of mini jack. That’s right. The minus from mini jack is linked to the minus of the speaker, right. The last contact is left. It’s the minus of crown connector linked to the minus of the speaker. Here it is, that’s right. Let’s test it. Connect the crown, insert a mini jack, that’s ok.
Open the video, no sound, turn on the switch, volume up. I’m forced to put volume down, because it’s too loud. It sounds very well, I imagine how it will sound when there will be a body. It would be not just a dynamic with a sound intensifier, but a speaker. That’s just awesome. Don’t forget to press thumbs up, if you like the video. So see you in the next video in which I’ll show you how it is supposed to look, and how to make body of a speaker interior we have been assembling today. Have a nice day! Bye-bye!
Do you know?
Infrasound is sound that is lower in frequency than 16 Hz. The infrasounds are successfully spread under water, helping the whales and other sea animals to orient in the water depth. Even thousands of kilometers don’t cause obstacles for infrasound.