Hi,
I am in the phase of building my first power-amplifier. It is clear, that I am not going to power it on the first time, while connected to my expensive speakers. Especially, since I am a total noob.
Any recommendations for a test speaker? The one, that takes the first spike? A very cheap one, that I just rebuild or re-buy should I ever blow it up?
Of course, you may say: "Any cheap speaker between 4 and 8 ohm may do it". But maybe it's better to have a 4 or 6 or 8 ohm speaker? Which one? Since I want to test the electrical behaviour, there may be some interesting features, such a reliability-test speaker should have?
Thanks.
I am in the phase of building my first power-amplifier. It is clear, that I am not going to power it on the first time, while connected to my expensive speakers. Especially, since I am a total noob.
Any recommendations for a test speaker? The one, that takes the first spike? A very cheap one, that I just rebuild or re-buy should I ever blow it up?
Of course, you may say: "Any cheap speaker between 4 and 8 ohm may do it". But maybe it's better to have a 4 or 6 or 8 ohm speaker? Which one? Since I want to test the electrical behaviour, there may be some interesting features, such a reliability-test speaker should have?
Thanks.
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You need a dummy load, which is an 8 Ohm non-inductive resistor, for each channel.
Never connect a speaker to an untested amplifier.
These need a heat sink. https://www.parts-express.com/8-ohm-100w-non-inductive-dummy-load-resistor--019-020
These don't need a sink, but you would have to use several in series-parallel to reach a high power level.
https://www.parts-express.com/dayton-audio-dnr-80-8-ohm-10w-precision-audio-grade-resistor--004-8
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Second that idea!
When you connect the amp to the dummy load make sure to check for DC voltage on the output. You should be able to trim the bias to reduce DC voltage down to some tens of milliVolts. Excessive DC causes the speaker voice coil to unnecessarily heat and leads to failure.
For the moment I am going to build two amps. The one based on an Anaview ALC0300-1300 Class-D module (see this for photos of a nice build), the other one is this: Sure Electronics AA-AB32512 (a build with photos is here)
My experience is total noob. I just startet learning electronics a few weeks ago, have a soldering station and two multimeters. I have built some small circuits, that I ordered from China, like a pocket FM radio, two little power-supply units (like this, for example: 0-30V 2mA - 3A Adjustable DC Regulated Power Supply DIY Kit)
That's it. Oh, and I am enrolled in an online-electronics course
May I suggest you have someone translate the warning in red lettering above the first picture of your third link. Than read it. Again. This applies for both amps you want to build.
Than, I suggest you start with something simple and inexpensive, like a 5 Watt amp, to gain some experience. Sparks and smoke are expensive byproducts of DIY. E
Than, I suggest you start with something simple and inexpensive, like a 5 Watt amp, to gain some experience. Sparks and smoke are expensive byproducts of DIY. E
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