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Stereo 3-way Crossover
Markus has acitvated his "Topas plus", based on a Hobby-Hifi concept. Here's his filter:
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Some commends from Markus:
Like I've mentioned, I've changed to a more powerful power supply
because your original one (the old version) has been went to hot for
my sensation. To simplify matters I've used some modules from
Thel-Audioworld which I've modified with bigger capacitors to avoid
noises on power-down (before the mute-relay has switched). Also a
supplementary power supply was needed.
Furthermore I've added two simple delay circuits for a delayed unmute
and to make sure to power on Vcc then Vdd in sequence.
At output I've added a three-stage freely adjustable gain-control for
easy adjustment to miscellaneous environments.
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Commends to the "old" version of the PSU DCN:
We have had some problems of the small Hahn PCB transformers, which have been used on all of our power supplies for DCN23.
We started out using a 2 x 7,5V transformer, but it doesn't perform as it should due to higher losses within the transformer itself.
To get the current the DCN23 needs we replaced the 2 x 7,5V with
2 x 6V (same size and VA) and all worked well – we thought, but at
lower mains voltages there isn’t enough to regulated on with the standard capacitor for the 7,5V transformer, so now we recommend
replacing the 1000uF with 2200uF on the Vcc supply or on all of the supplies. Lately we have discovered a bigger (VA) transformer with
the same footprint from Hahn, with which we will be upgrading the old PSU DCN - so that customer can get an optimum power supply.
Part number of the new Hahn is BV EI 306 2075 (3,2VA - 2x6V 265mA). The new PSU DCN II has a custom-made 10VA transformer and it
will produce enough power...without gettin too hot..!
"The sound is pretty enthralling"
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active@groundsound.com