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 Forum index » DIY Hardware and Software » Jürgen Haible designs
JH720 - some questions
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Boerge



Joined: Sep 02, 2009
Posts: 39
Location: Germany

PostPosted: Mon Nov 19, 2012 6:16 am    Post subject: JH720 - some questions Reply with quote  Mark this post and the followings unread

Hi all,

I'm just looking at the JH720-schemos and trying to understand some things.
1. What purpose could the connection from the waveformer to the LFO have? (at the upper right angle here: http://jhaible.de/jh_720_vco_waveform.gif ) I think he used an VCLFO, but why modulate the LFO with the VCO-output?
2. There are some parts ending in a "not used"-branch at the emitters (diode - resistor - cap - resistor) of the PNP-transistors. Could they left out or would that change the waveform?

(I'm thinking about making an DualVCO of it Wink )

greetings

Boerge

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