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Old 1st February 2016, 04:26 PM   #1
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Default DN2540 Power Amp

So here's what i am thinking:

a single TO-220 DN2540 on a 200v supply. 60-80mA and a 5K:8 transformer load. 10ohm source resistor. Cap across source resistor?

unsure of power output or even if this is feasible?

thoughts?

I am looking to do a small 1 transistor / mosfet amp.

Thanks!
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Old 1st February 2016, 04:40 PM   #2
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With 200v supply and 60mA you will fry the Fet; check maximum dissipation.
Don't go beyond some 5 watts of dissipation with a TO-220 part.
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Old 1st February 2016, 05:04 PM   #3
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The TO-220 has a 15W dissipation limit. If i go to about 75% of that or 10-12W would that work?

thinking 150v supply. 60 mA to 80mA.

If i do 3 DN2540 in parallel.. could use a Edcor 1.25K:8 output transformer. might get 10W output power.

Even with a decent heatsink you would not go above 5W on the 220?
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Old 1st February 2016, 05:11 PM   #4
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Quote:
Originally Posted by AudioGeek View Post

Even with a decent heatsink you would not go above 5W on the 220?
Correct.
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Old 2nd February 2016, 02:06 AM   #5
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100V@50mA with 1k:8 would get ~1watt of output and be doable for 1 device.
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Old 2nd February 2016, 07:54 AM   #6
Elvee is offline Elvee  Belgium
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You could practically reuse this schematic, only a few minor adaptations to make:
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Old 2nd February 2016, 02:50 PM   #7
Ketje is offline Ketje  Belgium
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Or try something like this
Mona
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Old 2nd February 2016, 06:11 PM   #8
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on that last diagram... why the diode and zener on the primary of the output?

does anyone have the ability to simulate this circuit?
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Old 2nd February 2016, 07:10 PM   #9
Ketje is offline Ketje  Belgium
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Quote:
Originally Posted by AudioGeek View Post
on that last diagram... why the diode and zener on the primary of the output?

does anyone have the ability to simulate this circuit?
That's to prevent voltage spikes from the OPT destroying the fet.
Same as on the schematic from elvee, but there it is a VDR.
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Old 2nd February 2016, 09:03 PM   #10
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by AudioGeek View Post
does anyone have the ability to simulate this circuit?
Here is the result, using your data + half-realistic parameters: output power 2W for 3%THD, nominal sensitivity 500mV rms.
Nice harmonic profile, typical of SE (discounting the transformer's distortions).
Note that I find 200V uncomfortably high, but if the DN withstands it, why not.

I kept the dissipation in the DN at <6W, which means R1=27Ω, not 10, but insisting on 10Ω would either mean serious complications or a much higher dissipation in the MOS, none of which is desirable for such a simplistic circuit.
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