Here’s a active 2 way simple crossover project for you.
About the circuit
The Circuit is simple and uses only 3 opamps per channel.
Crossover frequency is set around 234Hz. The cutoff(crossover) frequency can be changed for your requirement. The formula for the crossover frequency indicated below:
C4 is used to block DC voltage at the input. Since the input impedance of the circuit is very low, C4 value can be as low as 0.022uF. But for my final circuit I have used 0.1uF.
R3 and R4 are voltage divider used to provide half VDD voltage for the op amps. This is required because the power supply has no negative voltage. Without this, the output will be clip on negative cycle. C3 is just a filter capacitor to clean the voltage produced by the R3 and R4 divider. R5 is used to set the input of the input buffer to half VDD, 1Meg value is used so it will have little effect on the input impedance.
Simulation
Simulation result
As expected, the crossover frequency is around 234Hz.
PCB
For PCB design, I made it single layer so most of the DIYers can easily make their own PCB. As usual I used KiCad to design the PCB which is a free software. Resistors on the VDD are just jumpers(that is why it has value = 0).
J1 – Right input
J2 – Left input
J4 – Low Right output
J5 – Low Left output
J6 – High Right output
J7 – High Left output
J3 – Power Supply (12V – 24V)
3D Render
3D render using KiCad…
DOWNLOADS:
This project can be downloaded for you own personal use. If you want to use this for commercial use, please contact me on my Facebook page for licensing. 🙂
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