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 Forum index » DIY Hardware and Software
What about the VCF and ADSR Modules from Hearn Morley
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acidblue



Joined: Jun 26, 2009
Posts: 192
Location: The Darkside

PostPosted: Mon May 12, 2014 4:07 pm    Post subject: What about the VCF and ADSR Modules from Hearn Morley Reply with quote  Mark this post and the followings unread

Anybody make the VCF from the HM2040 module??
https://sites.google.com/site/hearnmorley/products/hm2040

I'm asking cause I like to make a few myself, but after looking at the
example schems I noticed it doesn't show where to place pots for frequency and resonance, or am I missing something?

Also The HMADSR1c module schem shows CV inputs for modulating ADSR but what about manual control, where would one place pots??
https://sites.google.com/site/hearnmorley/products/hmadsr1c
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bod



Joined: Apr 28, 2009
Posts: 148
Location: Glasgow

PostPosted: Tue May 13, 2014 4:51 am    Post subject: Reply with quote  Mark this post and the followings unread

it depends on how you use the filter, as the state variable filter HM2040StateVariableFIlterExample.pdf (72k) has input for the resonance CV (0-10V) and an input for the cutoff labelled as "CV", where as the example 4 pole filter in the data sheet has the res pot in the feed back loop, but the cutoff input is labelled "1V/Oct".

for the ADSR you can attach pots to the inputs, ADR expect 10V CV's in the Typical Connection Diagram, where as the sustain is between 0-VPK. VPK being the voltage set by the two resistors on the VPK pin. again just attaching the wiper of a pot to this inpot and the out lugs to GND and 10V or VPK respectfully will give you perfect input voltages for manual control.

there was another thread on here somewhere about these modules. they look pretty cool i have to say but I havent used them, yet.
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acidblue



Joined: Jun 26, 2009
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PostPosted: Tue May 13, 2014 2:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

I would like to use the filter module as a state variable filter.
So what your saying is I can place a pot for frequency where it has 'CV' and one at the 'resonance'?.
Can I place a CV input in parallel so I can have external modulation as well?

As for the ADSR module I would also like to have both manual and external CV control, so as per your suggestion I was thinking I could place pots in parallel to the inputs after the resistors.
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magman



Joined: Feb 04, 2009
Posts: 361
Location: Liverpool, UK

PostPosted: Thu May 15, 2014 7:33 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm not sure if you have picked this up, but the HM2040 module is a clone of the SSM2040 chip, so you can substitute it for any designs that use this chip.

Regards

Magman
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bod



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PostPosted: Thu May 15, 2014 9:57 am    Post subject: Reply with quote  Mark this post and the followings unread

You can sum the pots and jack inputs together with resistors, or use op amps for active mixing, either would do ultimately though.
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acidblue



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PostPosted: Thu May 15, 2014 3:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

I was thinking something like this.

The pot would be for manual adjusting without the need for CV in, but I would still like to have CV control as well.


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bod



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PostPosted: Fri May 16, 2014 1:45 am    Post subject: Reply with quote  Mark this post and the followings unread

i would add a resistor to the wiper of the pot the same as the input of the jack, but also i would only connect the pot to GND and +12v, as the control voltage range of the ADSR inputs are 0-10V. Youd find there is also dead space on the pot where the voltage goes beyond 10v, so a suitably calculated resistor on the +12v side (acting as a voltage divider witht the pot so it sweeps between 0-10v) and would give you the full range of use.
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acidblue



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PostPosted: Fri May 16, 2014 7:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok thanks, I'll have to go buy some modules now and give it a try. Very Happy
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