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DIY For Audio
New Build... the GEM amp
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<blockquote data-quote="Ampdog" data-source="post: 71832" data-attributes="member: 144"><p>As Ludo says ......</p><p></p><p>A further problem is that 'matching' has to be done at more or less the design collector current. The shown multimeter shows gain at a constant base input current, thus if gains differ, the collector currents also differ. One could argue that for similar gains the collector currents would be similar .... but rather an unsatisfactory situation for selecting transistors, at unknown collector currents. (One can build a transistor gain meter with adjustable collector current for such purposes.)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 71832, member: 144"] As Ludo says ...... A further problem is that 'matching' has to be done at more or less the design collector current. The shown multimeter shows gain at a constant base input current, thus if gains differ, the collector currents also differ. One could argue that for similar gains the collector currents would be similar .... but rather an unsatisfactory situation for selecting transistors, at unknown collector currents. (One can build a transistor gain meter with adjustable collector current for such purposes.) [/QUOTE]
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DIY & Tutorials
DIY For Audio
New Build... the GEM amp
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