The Eisen Audio DIY500 Minimal Kit provides you with the framework upon which to build one of countless preamp permutations. Our printed circuit board (PCB) accepts over 20 discrete op amps, more than 50 input transformers, and at least 12 different output transformers. We give you the means to turn these devices into a stellar-sounding mic pre, with an unprecedented amount of ease. Choose from a growing collection of example circuits, or create/clone your own.


Fits all 500 Series lunchboxes and racks!


DISCONTINUED!!! Please order the DIY500 mkII Minimal Kit instead.


Includes everything shown here



BILL OF MATERIALS

QtyDescriptionDesignationValueManufacturerPart Number
1printed circuit boarddouble-sided, gold fingerEisen AudioDIY500v3
1front panelengraved aluminum, blackEisen AudioDIY500-FPv1
1side panelgalvaneal, naturalEisen AudioDIY500-SPv1
1potentiometerRV110k ohms, CCW logHoneywell/ClarostatVA388-10KΩ-RZ
1control knob0.7" dia., alum inlay, blackEHCDC1N-2-B
1switchSW1DPDT, pushbutton, silverITT, Cannon/C&KF2UEE
2switchSW2, SW3DPDT, pushbutton, goldITT, Cannon/C&KF2UEE AU
3switch capround, chromeE-SwitchTAG CHROME
1connectorCONN11/4" stereo, switched, chromeNeutrikNMJ6HCD2
7socketA10.04", gold flashMill-Max0344-2-19-01-34-27-10-0
2machine nut3/8"McMaster-Carr
3hex standoffzinc-pltd brass, 4-40, 1/4"McMaster-Carr90308A162
2washerzinc-pltd steel, #4, 5/16" odMcMaster-Carr90126A505
3machine screwphillips flat undercut, 4-40, 1/8"McMaster-Carr91771A103
3machine screwphillips pan, 4-40, 3/16"McMaster-Carr90272A105
2machine screwphillips pan, 4-40, 7/8"McMaster-Carr90272A114

Component designations refer to the DIY500 schematic diagram.


This kit is not intended for first-time DIYers. In addtion to soldering a PCB, the builder is also required to purchase the transformers, op amps, and passive components (resistors and capacitors) with which to populate it. Step-by-step instructions are not yet available, but there is a growing amount of information on our website and customer support to assist in the process.

Complete kits more suitable for beginners, as well as finished modules, containing ALL of the necessary parts will be available in the future.

We also build custom modules, upon request, and can work with you to design a preamp specifically for your needs. Pricing is comparable to that of other 500 Series mic preamps, and includes a 3-year limited warranty.


Specifications subject to change without notice. GMT