A question regarding Merlin's Active Smoothing chapter 4..
In Merlin's book Power Supplies for Valve Amplifier there is chapter 4.4 about Active Smoothing.
In that chapter there is section 4.4.1 The Capacitive Multiplier, and section 4.4.2 The Gyrator or Simulated Inductor.
To my untrained eye fig 4.29 (practical cap multiplier [CM]) and fig 4.35 (gyrator circuit) look quite similar (I not sure if it is permissible to post the schematics so I shan't).
So.......could a gyrator and a CM be combined into their one unit?
The only advantage may be a little space saving.......I dunno.
I think Gingertube posted a schematic similar to what I envisage.
https://www.diyaudio.com/community/threads/power-supply-mosfet-vs-choke-filter.261117/#post-4038197
Is it possible to do this and if so and both are combined is there anything to look out for?
tim
In Merlin's book Power Supplies for Valve Amplifier there is chapter 4.4 about Active Smoothing.
In that chapter there is section 4.4.1 The Capacitive Multiplier, and section 4.4.2 The Gyrator or Simulated Inductor.
To my untrained eye fig 4.29 (practical cap multiplier [CM]) and fig 4.35 (gyrator circuit) look quite similar (I not sure if it is permissible to post the schematics so I shan't).
So.......could a gyrator and a CM be combined into their one unit?
The only advantage may be a little space saving.......I dunno.
I think Gingertube posted a schematic similar to what I envisage.
https://www.diyaudio.com/community/threads/power-supply-mosfet-vs-choke-filter.261117/#post-4038197
Is it possible to do this and if so and both are combined is there anything to look out for?
tim
Gingertube identified that a link changes the functional operation - so two different functions for two different circuit configurations. There is nothing stopping you from exploring what may happen if you change the circuit configuration to try and achieve both functions simultaneously, but you likely need a good level of circuit design experience, and simulation, and experimental setup and test experience. It may be worth your while separately testing a circuit for each function and appreciating how each one performs and why circuit values are chosen as x or y, and what that does for a particular performance metric.
Thank you for your advice Tim.
And I hope you haven't been affected by the flooding in Oz
Gingertube actually said:
"......which can operate as a true simulated inductor (link out) or in a mode with reduced simulated inductor behavior but capacitance multiplier function added (link in)......."
So perhaps both functions can be accommodated; though I take your point that simulation is likely very wise.
best
And I hope you haven't been affected by the flooding in Oz
Gingertube actually said:
"......which can operate as a true simulated inductor (link out) or in a mode with reduced simulated inductor behavior but capacitance multiplier function added (link in)......."
So perhaps both functions can be accommodated; though I take your point that simulation is likely very wise.
best
Ta - missed that subtlety. I've simmed the e-choke circuitry and tried to collate as much on that generic topic, and used a Picoscope and FRA4pico software to get some performance insight on a prototype. In general, a particular e-choke configuration is needed for a particular dc current and ripple voltage environment, which may then limit application to class A or minor AB1 operation.
My post from a year and a half ago: https://www.diyaudio.com/community/threads/e-choke-performance-testing.406704/
In practice it may be difficult to better the performance of a choke such as a flouro tube ballast with a relatively high first resonance frequency, although for sure the size reduction is a bonus.
Ciao, Tim
PS. I'm luckily in Melbourne, so avoiding any floods and droughts and mountain ranges.
My post from a year and a half ago: https://www.diyaudio.com/community/threads/e-choke-performance-testing.406704/
In practice it may be difficult to better the performance of a choke such as a flouro tube ballast with a relatively high first resonance frequency, although for sure the size reduction is a bonus.
Ciao, Tim
PS. I'm luckily in Melbourne, so avoiding any floods and droughts and mountain ranges.
I like Melbourne
I like the markets
And I like the trams
I presume you know that Gingertube's schematic is a copy of the Tent Labs E-choke
t
I like the markets
And I like the trams
I presume you know that Gingertube's schematic is a copy of the Tent Labs E-choke
t
Tent Labs were obviously quite keen to avoid their circuitry getting into the public domain, and somewhat minimalist with any performance testing/data.