[552] Direct Box PCB

Date: October 22nd, 2009 | Comments : [2] | Categories: DIY.

Direct box pcb

This is a pair of completed pc boards (opamp multi-purpose) that are configured for use as direct boxes. The sockets are empty as I have not yet decided what opamp chip to use. I may experiment with several different parts before putting the boxes into regular use in the studio.

If you have purchased the Opamp Multi-Purpose pcb, you should check the construction page again since I have changed a few values on some of the projects. The link was emailed to you after you bought the board.


2 Responses to “Direct Box PCB”

[759470] Tom Says: 2:30 am, November 28th, 2015

I have just built one of these and used a NE5534 and changed R1 to 4K7 and R2 to 47K and it suodns great but what I would like to know, is there a way of cutting the highs by changing any of the components rather than having to add a tone control? Cheers.

[759607] admin Says: 1:56 pm, November 28th, 2015


Add a capacitor in the C3 position. A 1000pF will set the highs to roll off at about 16kHz.

If you use a larger value capacitor, then the corner frequency will move down. A 2200pF capacitor sets it at about 7.2kHz.

You can try a few values and test by listening to see what you like.

regards, Jack


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