Picture of Audio Crossover

This Instructable show how to make your own audio crossover.
My circuit garranties excellent high class audio quality.
Just a new design to reduce crossover frequency losses.

In this instructable you'll need the folowing items:

A drill
Pcb board
A soldering iron
Deoldering Pump
Ferric Chloride or any other Cooper echent
A horizontal drive transformer ( found in televisions)
10uf and a 2.2uf non-polarized capacitor
1.5 mm to 3.5 mm drill bits
A  speaker box with an tweeter and loudspeaker
A digitial or analog multimeter
A permanent maker
Styrofoam Plate
Six strips of wire preferable three different colours about 1.5 metres
Surgical Alcohol

Step 1: Summary Of Operation

Picture of Summary Of Operation
horizontal driver transformer.jpg
This is the schematic, simple and easy to make if your not doing the pcb.
It can be placed on a breadboard with ease, overall it shows you how to connect it.

Well the transformer that i used can be found in a crt television set and it must be selected based on the power rating of your speaker. 
I have a 15W Loudspeaker and a 5W tweeter this transformer is fairly small, so if you plan to have speakers that are very powerful i advise you to get a transformer of similar ratio but bigger. The transformer's ratio is 1 : 5.
Its primary resistance was 0.8 ohms and secondary 3.4 ohms

The same goes for the capacitors the voltage range is small like 16v -50v for small power applications. As you increase your output power the voltage of the capacitors must increase to the range of 100v -250V. The value of the capactors usually stay the same. Use non polarized capacitors because they wouldnt be damaged by the alternating voltage.


What are the details of the low pass and high filters? I have no idea what they are and I can use some help in that department. I recently completed a TDA2030A stereo amp and I'd really like to be able to add something like this for increased audio performance. Thanks Josh.

broorb11 months ago

great work! congratulations!

Would you mind sharing the specs for the transformer that you used ?



josh1001 (author)  broorb11 months ago
Thanks broorb but to tell you the truth I can't remember the part no. on the transformer, but I can say you can find the transformer in an old crt television it will be identical to the one I have displayed, I think its properly good for about 25w rms
If I only wanted to make a low pass filter (with req. circuitry) and follow up by using the transformer and afterwards a logarithmic potentiometer to control my bass, would this work?
josh1001 (author)  Merlincolde1 year ago
Yes u can, just have place the pot in series with c2 and ground, I would go with no more than a 10kohm pot
ivanjacob3 years ago
looks pretty good! im planning on building a 12v sound system and im gonna use something like this
josh1001 (author)  ivanjacob3 years ago
cool a good transformer does the trick