If you are looking for a good yet not so complicated 2 way crossover project. I got one for you. It is using only 2 op amps for 1 channel, for stereo you will be needing 2 TL072 op-amps. The Circuit can be powered with single 9V up to 36V.
About the circuit
Take note that there are 2 kinds of crossover, they are active and passive crossover. Passive crossovers are usually used in speakers for separating the signal for tweeter, midrange and woofer speaker from the output of the amplifier. Active crossover which is the one I posted here are used to separate the signal into 2 or 3 sections(low, high and mids for 3 way crossover) from the output of the signal sources like mp3 player. Active crossovers are placed in between the signal source and the amplifier, while passive signal source are placed in between amplifier and the speaker. This means that if you are using an active crossover, you will be needing at least 2 amplifiers(depends on how many outputs your crossover have, in this case 2 – 1 for high and 1 for low frequency).
The circuit only uses op-amps for 1 channel. The crossover frequency can be computed by:
f = 1/(2*pi*C*R)
Note:
* pi = 3.1416
* On the circuit R = R1=R2=R3=R4 and C=C1=C3=C4=C5
The current value of the components have a crossover frequency of ~160Hz. You can change it as you desire by using the formula above
Simulation
The simulation confirms the crossover frequency of around 160Hz.
PCB design
Here’s a simple design using Eagle PCB
DOWNLOADS
You can download the eagle files on the download page.
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