Mezmerize B1 Buffer
- 1 x Mezmerize B1 Buffer PCB
The Mezmerize is a direct coupled preamp (no coupling caps) based on Nelson Pass's B1 Buffer. It boasts symmetrical Salas shunt voltage regulators that use LED strings for very accurate voltage reference. The PCB has provisions for up to 6 relays for input signal switching and an output relay for delayed start-up muting.
These boards are intended for adventurous / advanced DIYers willing to dedicate their own time to research what's needed to complete their project. There is no complete project kit, no parts kits, and no build guide. It's an amazing project for those looking for something different.
Please visit the Mezmerize Helpdesk Thread for questions.
Notes on the re-issue, Bill of Materials and Schematic
- Mezmerize "10 Years After" BOM and Notes UPDATED 2019-08-02 (PDF)
- Mezmerize "10 Years After" Schematic (PNG)
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Nick's comment on JFET IDSS choice
| Dimensions |
|
|---|---|
| Mounting holes | Holes on 10mm x 10mm grid |
| Number of boards included | 1 |
| Layers | 2 |
| Board Revision | 2C |
My build was balanced using two boards, 2 pole selector, and I used two dual pots for separate volume controls. It has 3 XLR inputs and 3 RCA. An inverter provides balanced outputs for the RCA inputs. Outputs are XLR and RCA - XLR pin 2 through 100 ohms to the RCA as recommended on the forum. Each board is powered with a AnTek AS0515 toroid. Left the board ground/common floating. Mu-metal shielding was put between the transformers and the boards. I added 8 Jantzen 4.7uf Superior Z-cap output caps on boards above the Mez boards with relays to short them out (bypass) with a back panel switch. I want to add a mute switch on the front perhaps to the on-board power up mute relay or I may add one. I built an Allen Wright RTP5 clone which sounds awesome. This Mez sounds more mellow yet the sound is detailed and pleasing. I also tried a B1 clone operating on 24VDC and was admittedly under powered compared to the Mez which sounded flat and dimensionless compared to this Mez build. I matched the LSK-170B FETS, buying around 30.
This board is a great way to go both for great sound and easy on the budget.
I have 4 of these. Enough said!
I have received the PCB´s but not put them to use yet.
Perfect!
Superior build!
Mezmerize B1 Buffer