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New Telescope-Service Online Shop:
About Boxdoerfer Elektronik
Boxdoerfer is a company specialized on the creation of motor drives with high accuracy and sophisticated photographical functions. The controllers are made in Germany.

Unlike mass-produced controllers the Boxdoerfer controllers are well thought through in detail, leaving nothing to be desired by the advanced user.

Drives are available for various equatorial mounts from many different manufacturers.
Available Boxdoerfer Controllers and Drives
Boxdoerfer Dual Axis Drives
Boxdoerfer Controllers


Powerflex Photographical Dual Axis Motor Drive


Motors with gears and installation kit for GP type mounts.
A Sophisticated Dual Axis Motor Drive for Serious Long Exposure Astro-Imaging and Demanding Visual Use - Large Scope of Delivery!

This dual axis motor drive kit uses good quality and powerful stepper motors with metal body and a very low tracking error.

Manual clutches are included so that you can continue using your mount manually if you choose to do so.

We offer two different variants of this dual axis drive: The standard version uses the Powerflex MTS-3SLP controller. This controller offers a long list of features that make it specifically suited for astro-imaging:

- periodic error correction (PEC)
- declination backlash compensation
- customizable setting and correcting speeds.
- half-step mode
- many other helpful features

You will find additional information
here

You can also choose the MTS-3SDI controller which adds further features.

Boxdoerfer dual axis drive mounted on a typical EQ mount
The Powerflex Dual Axis Motor Drive Kits Fit:

Vixen
.................................. GP-E, GP, GP-D2
Telescope-Service ............ Astro-5
Celestron ........................... advanced Mount (ADM)
Synta .................................. EQ-4 , EQ-5

And many other similar mounts.

Installation of the drive is very simple and takes only a few minutes.

Quality In All Parts

All parts were chosen for their quality. The motor plugs are good quality, the gears, the motors themselves, and of course in particular the controller. Arctiflex cables will stay flexible even 40° below zero.

Prices and availability: Please see our new Online Shop


These controllers were created specifically for long exposure astro imaging. They can be used with nearly any mount with stepper motors.
The controllers are compact and lightweight and offer many sophisticated features for better results in astro-imaging.
These features include, among many others: Periodic Error Correction (PEC), declination backlash compensation, customizable speeds, ...


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Powerflex with aluminium body

The bodies of the SLP and SDI controllers are identical
  • suited for all mounts with 2-phase stepper motors up to 500mA
  • power can be freely adjusted from 0% to 100% of the nominal value
  • optimized for minimal power consumption
  • Voltage from 10 to 28 Volts
  • Half step mode
  • gradual acceleration and deceleration via 8 selectable ramps
  • freely programmable for any mount
  • Sideral, solar and lunar tracking speeds
  • correcting speeds customizable from 1.0x to 2.0x
  • Step rates up to 5000Hz half step
  • all settings are applied instantly without waiting times
  • several standard settings available
  • Periodic Error Correction (PEC). The PEC data is saved when the controller is switched off.
  • DEC gear backlash compensation
  • all motor and mount parameters are freely programmable within generous bounds
  • all functions are integrated into a compact and nice-looking controller
  • compact dimensions (100 x 50 x 25mm)
  • good quality switches and buttons. Good quality plugs
  • undervoltage warning
  • plugs available for:
    • PC (RS-232)
    • CCD-Autoguider (ST-4, ST-7, Pictor and others)
    • external LCD Display
  • Stop watch function for long exposures - you need the optional LCD display for this
  • designed and manufactured in Germany with quality components
  • scope of delivery includes power cables
  • Upgrade to MTS-3SDI possible (controller needs to be returned to manufacturer)
Prices and availability: Please see our new Online Shop



MTS-3SDI controller with the optional display.
The Powerflex MTS-3SDI has all features of the SLP, plus the following additional features:
  • can be upgraded to new Software versions regularly without having to return the controller to the manufacturer. The update software is available at the Boxdörfer website.
  • Software-Updates are free of charge. Only the object database for GoTo costs 75 Euros extra
  • up to 1/64-Micro step mode for tracking (the power curve is a near perfect sinus curve). The result is a perfectly smooth tracking motion free of "jumps" at all voltages.
  • automatic micro-step switch function for accelerations in the fast mode. Up to 450Hz 1/8 step, up to 900Hz 1/4 step, beyond 900Hz 1/2 step
Upgrade To GoTo

The Powerflex SDI comes GoTo ready, you only need to enter the keycode to activate the GoTo functions. It is no longer necessary to send the controllers back to the manufacturer for the modification. The keycode can be bought from us at any time. We only need the serial number of the controller.

In addition you will also need the display which is also available separately. Installing the display is easy and can be done by the customer.

The additionial GoTo functions include:

-- GoTo database with over 2000 objects
-- Logical menu
-- Simple alignment procedure (one star alignment)

We also offer this controller in a complete GoTo kit with or without motors. If you own an SDI controller already you can also buy the motors separately. ................................................................................................ Further Information
Prices and availability: Please see our new Online Shop