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'''Hearn Morley''' of Bristol England, manufacture a range of miniature [[analog]] audio plug-in modules. These include [[Voltage controlled oscillator]]s (VCO), [[Voltage controlled filter]]s (VCF), [[Envelope generator|Voltage controlled envelope
== Hearn Morley modules ==
* [[HM2040]] an equivalent of the now obsolete [[SSM2040]] VCF IC.
* [[HMVCO1c]] an [[exponential]] VCO. The design is adapted from a VCO design by [[Terry Mikulik]] published originally in the [[Electronotes]] series.
* [[HMADSR1c]] a voltage controlled envelope generator.
* [[HMVCA1b]] a dual linear voltage controlled amplifier
== References ==
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== External links ==
* [https://sites.google.com/site/hearnmorley/ www.hearnmorley.com]
[[Category:Analog integrated modules]]
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