PWM Dimmer for telescope heating

incl. 27% VAT

26.84
Including 27% VAT:
26.84 € (10 200 HUF)
Net price (for non-EU customers):
21.13 € (8 031 HUF)
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Product code: Dimmer6A

PWM Dimmer for telescope heating (12-24V, max.6A)

Dimmer for regulating the heating output

It is necessary to heat dew caps and optical elements to prevent dew formation on the optical surface. However, too high a heating power leads to turbulence in front of the optics and deteriorates the image quality. In order to achieve an optimal, dew point-related temperature difference between the environment and the optics, dimmers for the heating sleeves and heatable dew caps are used.

Why PWM?

In theory, it would be sufficient to reduce the voltage using an ohmic resistor in order to dim electrical power for heating jackets or incandescent lamps. However, we recommend dimmers with pulse width modulation (PWM for short) for two good reasons:

PWM does not absorb the power that is not required through heat, consumes less energy, and additional cooling surfaces (passive cooling) are not required

The peak voltage remains the same, so the brightness of semiconductor light sources (such as LEDs) can also be dimmed.

In short, the voltage itself is not reduced in this case, but instead the time interval is regulated, in which the full voltage is effective: The regulating instrument is switched on and off in quick succession. Depending on the switch-off / switch-on frequency, various accessories can be operated: for a heating jacket, switching it on and off once per second would be enough, or even less, because its inertia is very high. In everyday life, around a hundred cycles per second are sufficient for such dimmed LED lights (e.g. living room lighting), because the human eye can barely perceive the vibration from a frequency of 25 Hz. A very delicate instrument, however, is the FlatFieldBox (FFB) lighting for astronomical CCD cameras, where because of the extremely short exposure time required in the (sub) millisecond range, a switch-on and switch-off frequency of 25kHz or even faster is desired!

Technical specifications

  • Input: 5.5 / 2.1mm (note polarity: center positive)
  • Output: RCA (note polarity: center positive)
  • Frequency: 1 kHz (switches on and off 1000 times per second)
  • Maximum current: 6A
  • Input voltage range: 12-24V
  • Cable length: each 15cm on both sides
  • Weight: only 75 grams

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Recommended accessories

Power cable 200cm (from power splitter box to EQ6, Mgen, etc)
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