[sdiy] Kronkite Filter and sound generate without generators

[harrybissell]

Hi Mike... inline

Mike Brown wrote:

> yeah... the company is Krohn Hite.  I have a dual filter that I've
> been using for a new music project I'm working on (all
> industrial/military lab equip)... it's two high pass/low pass filters
> that you can chain together for band pass/notch filtering.  works OK,
> but I've got to hack it in order to add resonance (feedback).The
> interesting thing is that when you look inside, the main frequency
> knob is connected to a long shaft with 4 gears that turn 4 smaller
> gears on 4 pot shafts.  When I looked at this, I thought, "why didn't
> they just use a quad-ganged pot?"  then I realized the gears were
> reduction gears and that each of the 4 pots, depending on the number
> of teeth on the gears, could have different reduction ratios.  man...
> that's something I never would have dreamt up.
>
> not in a good dream anyway... the trouble is that pots with different
> gear ratios would
> reach the stops at different times.  I'm not sure that would work.
> Probably the gearing makes
> it easier to turn the knob, giving good resolution at the expense of
> speed
>
> H^) harry
>
>
>
> Mike Brown wrote:
>
>>  yeah... the company is Krohn Hite.  I have a dual filter that I've
>> been using for a new music project I'm working on (all
>> industrial/military lab equip)... it's two high pass/low pass
>> filters that you can chain together for band pass/notch filtering.
>> works OK, but I've got to hack it in order to add resonance
>> (feedback).The interesting thing is that when you look inside, the
>> main frequency knob is connected to a long shaft with 4 gears that
>> turn 4 smaller gears on 4 pot shafts.  When I looked at this, I
>> thought, "why didn't they just use a quad-ganged pot?"  then I
>> realized the gears were reduction gears and that each of the 4 pots,
>> depending on the number of teeth on the gears, could have different
>> reduction ratios.  man... that's something I never would have dreamt
>> up.MB
>>
>>      -----Original Message-----
>>      From: owner-synth-diy at dropmix.xs4all.nl
>>      [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of
>>      Mustafa Umut Sarac
>>      Sent: Thursday, March 17, 2005 4:44 AM
>>      To: synth-diy at dropmix.xs4all.nl
>>      Subject: [sdiy] Kronkite Filter and sound generate without
>>      generators
>>
>>      I am reading electronic music guru Bulent Arel s letters
>>      from 40 years ago.He says he found a way for to generate
>>      sound without generators.He says one kronkite filter , two
>>      tape and one amp are enough for to generate complex
>>      sounds.May be I can build a mobile synthesizer for to
>>      generate sound on train or on bus with walkmans.I do not
>>      know what is kronkite filter. I googled but I could not
>>      find anything.Can you help me ? What is this arel
>>      technology and how it works . Where can I find Kronkite
>>      filter ? Best ,Mustafa Umut Sarac
>>      -----------------------------------------------------------
>>      Do you Yahoo!?
>>      Make Yahoo! your home page
>>
>
>
>
>
>
>
> MB
>
>      -----Original Message-----
>      From: owner-synth-diy at dropmix.xs4all.nl
>      [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of
>      Mustafa Umut Sarac
>      Sent: Thursday, March 17, 2005 4:44 AM
>      To: synth-diy at dropmix.xs4all.nl
>      Subject: [sdiy] Kronkite Filter and sound generate without
>      generators
>      I am reading electronic music guru Bulent Arel s letters
>      from 40 years ago.He says he found a way for to generate
>      sound without generators.He says one kronkite filter , two
>      tape and one amp are enough for to generate complex
>      sounds.May be I can build a mobile synthesizer for to
>      generate sound on train or on bus with walkmans.I do not
>      know what is kronkite filter. I googled but I could not find
>      anything.Can you help me ? What is this arel technology and
>      how it works . Where can I find Kronkite filter ? Best
>      ,Mustafa Umut Sarac
>      -------------------------------------------------------------
>      Do you Yahoo!?
>      Make Yahoo! your home page
>