May Queen
Treble Booster/Overdrive


This project is rated 1 out of 3 for the level of complexity.

May Queen, v2

Not an exact copy of the Brian May sound, but it will get you in the neighborhood with the need for a dozen AC30s or funky old car radios. Good distotion, smooth highs, and mids with excellent harmonics are the main features of this circuit.

The optional cap in parallel with the Q3 bias trim is a high end filter. Larger values will yield less treble content. A good starting point is 2n2, then adjust to your taste. There is no gain control. This circuit is intended for full gain all the time. Thanks to Gus, Aron, Robb, etc.

Listen to it!

JD Sleep sells a ready-to-solder PCB for the May Queen, shown below.

May Queen PCB

May Queen PCB

Here are transistor pin voltages from the above build (using a regulated power supply that measured 9.10v):

C7.10 C1.37 D5.52
B.629 B.628 G1.64
E29mV E0 S1.41

W. Percival kindly contributed a PCB layout (PDF, 53k) for the May Queen.
Note that this layout differs from the PCB sold by JD Sleep, which was designed by Dean Hazelwanter.

Creative Commons License
May Queen by is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
Permissions beyond the scope of this license may be requested.

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