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Very Simple 3BJT Headphone Amplifier
Very Simple 3BJT Headphone Amplifier
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Old 7th December 2017, 03:00 AM   #21
HotIce is offline HotIce  United States
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PCBs came in
They look nice.
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Old 23rd July 2019, 12:36 AM   #22
widea is offline widea  Netherlands
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Default how does it sound?

Searching for a design I encountered this interesting circuit.
I will probably try to build it (being deceptively simple) but how does it sound?
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Old 24th July 2019, 06:14 AM   #23
avtech23 is online now avtech23  Australia
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Very Simple 3BJT Headphone Amplifier
I'd be interested to hear from OP about how this project turned out too.
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Old 24th July 2019, 07:56 PM   #24
xrk971 is offline xrk971  United States
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Very Simple 3BJT Headphone Amplifier
I bet Hotice has some spare boards for those who are curious. I would imagine e it sounds great - like most SE Class A headphone amps usually do.
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Old 29th July 2019, 05:17 PM   #25
gasboss775 is offline gasboss775  United Kingdom
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Quote:
Originally Posted by xrk971 View Post
Nice design. I love SE Class A headphone amps. Could a BD139 work here instead of 2SC3852? For circa 100mA bias it probably is not necessary to use a 3amp transistor. Rosina 2SC4795 could work well too?
I have built this using BD 139's and a bc549.

I do not have the means to measure distortion but looking at the output on an oscilloscope I can get about 6.7 V peak to peak prior to visible clipping.
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Old 29th July 2019, 06:02 PM   #26
widea is offline widea  Netherlands
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Quote:
Originally Posted by gasboss775 View Post
I have built this using BD 139's and a bc549.

I do not have the means to measure distortion but looking at the output on an oscilloscope I can get about 6.7 V peak to peak prior to visible clipping.
How does it sound?
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Old 30th July 2019, 01:45 AM   #27
xrk971 is offline xrk971  United States
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Very Simple 3BJT Headphone Amplifier
Quote:
Originally Posted by gasboss775 View Post
I have built this using BD 139's and a bc549.

I do not have the means to measure distortion but looking at the output on an oscilloscope I can get about 6.7 V peak to peak prior to visible clipping.
Howto - Distortion Measurements with REW
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Old 30th July 2019, 02:13 AM   #28
Mark Johnson is offline Mark Johnson  United States
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Very Simple 3BJT Headphone Amplifier
It appears to me that the schematic in post #11 is an inverting amplifier. Some commenters in this thread have gone to great lengths (e.g. input transformers) to un-do the effect of an inverting amp and force it to operate in non-inverting mode.

With a pair of 2-terminal loudspeakers this is easy to reverse: just flip each speaker's (+) and (-). It's harder to do with headphones, whose (-) terminals are shorted together at the TRS plug.
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Old 30th July 2019, 06:12 AM   #29
avtech23 is online now avtech23  Australia
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Very Simple 3BJT Headphone Amplifier
In that case it might be interesting to try with my B1 korg to undo the inversion and use it as a HPA.
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Old 30th July 2019, 08:30 AM   #30
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Very Simple 3BJT Headphone Amplifier
Not sure if this sim is correct but I threw this together quickly:

Very Simple 3BJT Headphone Amplifier-capture1-jpg
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