| E-choke
Designer Menno van der Veen set the concept for this
DIY module. The E-choke replaces traditional chokes
that generally work quite well, but suffer from some
disadvantages:
• high weight
• relatively big size
• magnetic field radiation that induces hum in
the circuit
The
E-choke effectively solves all these issues, and offers
up to 70dB supply ripple reduction at currents up to
500 mAdc. In addition, intermodulation distortion reduces
dramatically,
see the measurements and background articles below.
UL40-S2, triode, distortion, power supply with only
capacitors
UL40-S2, triode, distortion, power supply including
E-choke
Look how effectively the choke removes the hum, but
also dramatically reduces the intermodulation products
of the signal (1 kHz) with power supply ripple (100
Hz)
Technical description
See the background article by Menno Vanderveen:
• E-choke
design (English)
Specifications
• Imax out 500mAdc
• Vmax in 450Vdc
(can be adapted to 600Vdc max when changing input capacitor
to suitable working voltage)
• Vripple 15Vtt (maximum input ripple)
• C-in 330uF/450V (included on module):
C-in may be reduced linearly when current consumption
is lower than 500mA
C-in must be reduced when valve rectification is applied
• C-out 330uF/450V (externally required, recommended
value)
• Voltage drop <17Vdc (in-out at 500mAdc load)
• Dissipation <5W
• Heatsink integrated, connected to gnd
• Rejection :
>40dB, time modus off (mostly used with class AB
amplifiers)
>60dB, time modus on (recommended for class A amplifiers)
• short circuit NOT protected, always include
fuse at module output
Mechanical
PCB size: 72*50*50 mm (W*L*H) (includes electrolytic,
excludes standoffs)
Hole pitch: 63*41 mm (symmetrical). All hole diameters
3.2 mm
Manual
No manual yet, but connections are fairly straightforward,
see example below:
Warrantee
This module is warranted for 5 years, assumed all mounting
instructions are followed
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