PRM
Overview
Key Specifications
| Parameter | Value |
|---|---|
| Mounting Width | 4 HP |
| Power Consumption | 12V @ 75mA |
| Power Connectors | 10 pin EuroRack ribbon, 2.1mm DC barrel |
| Video Sync | None |
| Included | DC barrel power cable, EuroRack power cable, red panel, green panel, blue panel |
Front Panel Options
PRM ships with a black front panel installed. Red, green and blue panels are also included. All front panels are printed on both sides, allowing a choice of top-to-bottom or bottom-to-top signal flow.
Controls, Connectors & Indicators
The PRM design was informed by years of studying interfaces common to the building blocks of analog computers and video processing equipment.
Example Patches
Half Wave Rectifier
Half Wave Inverter
Full Wave Rectifier
Four Quadrant Multiplier
Two Quadrant Multiplier
One Quadrant Multiplier
Exponential Amplifier
Sine Shaper
Parabolic Frequency Doubler
Linear Frequency Doubler / Ramp to Triangle Converter
2D Rotator
Divider
Minimum Value / Analog Logic AND
Maximum Value / Analog Logic OR
Analog Logic XOR
Voltage Limiter
Installation
Requirements
- EuroRack enclosure.
- 12V DC or EuroRack power supply.
- 2.1mm DC barrel power cable or a EuroRack power cable (both options included).
- Two M2.5 x 6mm mounting screws, or screws provided or specified by the enclosure manufacturer.
- #1 Phillips head screwdriver, or hand tool provided or specified by the enclosure manufacturer.
Procedure
- Power off and disconnect the EuroRack enclosure's power supply and any attached DC adapters.
- Connect only one of, the EuroRack Power Cable or the DC Barrel Power Cable to the module.
- Carefully test fit the module with its attached power cable in the open space in the EuroRack enclosure. If it is obstructed by the enclosure or any internal assemblies, abort this procedure.
- Connect the disconnected end of the power cable to the power supply.
- Mount the module to the EuroRack rails using all mounting holes.
- Store the unused cable along with the product box in a safe location.
- Power on the EuroRack enclosure and start patching.
Full Specifications
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 950066 |
| Pronunciation | piː-rɒm |
| Mounting Width | 4 HP |
| Mounting Depth | TODO mm |
| Mounting Hole Count | 2 |
| Power Consumption | 12V @ 75 mA |
| Power Connectors | 10 pin EuroRack ribbon, 2.1mm DC barrel |
| Input Impedance | 1M ohms |
| Output Impedance | 75 ohms |
| Input Protection Range | +/-20V |
| Input Clipping Range | +/-2.5V |
| Output Range | +/-2.5V |
| Propagation Delay | 32ns |
| Bandwidth @ -3dB | TODO |
| Module Width | 20.32 mm |
| Module Height | 128.5 mm |
| Module Depth | TODO mm |
| Product Box Width | 4 in / 101.6 mm |
| Product Box Height | 2 in / 50.8 mm |
| Product Box Depth | 6 in / 152.4 mm |
| Product Weight | TODO |
| Included | DC barrel power cable, EuroRack power cable, red panel, green panel, blue panel |
| EuroRack Power Cable Type | 10-pin to 16-pin |
| EuroRack Power Cable Length | 25 cm |
| DC Barrel Power Cable Length | 25 cm |
| RoHS Compliance | Manufactured with lead-free processes. |
| Video Sync | None |
Maintenance
Keep your module free of dust and debris by performing periodic cleaning. Spots may be cleaned from the frontpanel with a microfiber cloth and isopropyl alcohol or other electronics cleaner.
Hardware Revisions
The hardware revision code is printed on the circuit board visible from the rear of the module.
PRM-REVA
Initial prototype. September 2024.
PRM-REVB
Second prototype. December 2024.
PRM-REVC
Third prototype. January 2025.
PRM-REVD
Initial production version. February 2025.
Download PRM-REVD Schematic Diagram (PDF)
Download PRM-REVD Interactive Bill of Materials (ZIP)
DIY
PRM is available as a DIY kit that includes a PCB assembly with pre-assembled SMT components and 4 frontpanel options. The user must source the through-hole components such as headers and jacks, as well as a suitable power cable for the module.
In the Hardware Revisions section, you will find downloads for the complete schematic and an interactive HTML BOM.
Bill of Materials
In addition to the PCBs and components included with your DIY kit from LZX, you will need to source the following components from electronics parts vendors.
| Manufacturer | Manufacturer Part Number | Description | Quantity | Reference Designators |
|---|---|---|---|---|
| Wenzhou QingPu Electronics Co., Ltd | WQP-WQP518MA | 3.5mm Jack Mono Switched | 9 | J4, J5, J6, J7, J8, J9, J10, J11, J12 |
| Pin Header Pitch 0.1in 2X5 Male Shrouded | 1 | J2 | ||
| Wurth Elektronik | 694106402002 | DC Jack Vertical 2.1mm Barrel | 1 | J3 |
| Recom Technologies | R-78K5.0-0.5 | DC/DC Converter Submodule 5.0V | 1 | U5 |
Assembly Instructions
This assembly job is recommended for intermediate level DIYers who are comfortable soldering thru hole joints in close proximity to surface mounted parts.
- Mount and solder rear facing through hole parts first, in this order: pin header, DC/DC converter, DC barrel jack.
- Mount and solder front facing jacks next.
- Attach the frontpanel and secure it with mounting nuts for the jacks.