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3 Transistor HP Amplifier with low dist
3 Transistor HP Amplifier with low dist
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Old 10th June 2021, 08:11 PM   #221
knauf1919 is offline knauf1919  Europe
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Quote:
Originally Posted by Rick PA Stadel View Post
The one challenge (I can think of) to driving both at all times -- if the unused amp section will be powered down when not used

Cheers



Very good observation and must be put into practice.
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Old 10th June 2021, 08:14 PM   #222
knauf1919 is offline knauf1919  Europe
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Quote:
Originally Posted by joensd View Post
My question was more related towards why Knauf1919 doesnŽt like to see both amp inputs in parallel to the preamp-out.
Well, we all have our fixations in our brains.

)
I wanted to do something practical before I could give an objective answer. Looks like I can't find time to do that.
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Old 10th June 2021, 08:20 PM   #223
PRR is offline PRR  United States
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3 Transistor HP Amplifier with low dist
Quote:
Originally Posted by hanair View Post
Thus hackers can use your mobile phone and laptop to attack other devices and to disguise themselves.
I do not know how BT works for audio streaming, may be these concerns are already taken care of.
BT is probably the most complicated, buggy, and least understood communication protocol in consumer electronics.

In concept, it "could" be possible to lock it down to ONLY accept streaming music. In practice, I have never seen any fine user control of what it would accept.

Normally you have to 'connect', some human action like keystrokes, to open a BT link. However I know there are bugs and hacks, so this is not always needed.

It used to be BT's saving grace that it was short-range. The hacker almost had to be in your house. But I am near a dozen BT devices now, and I do not know what they say to each other. My strange neighbors here are too far for BT (but see Bluesniping), but if I lived in town I could have strange BT devices on all six sides.

bluetooth vulnerabilities list - Google Search
Bluesnarfing - Wikipedia
Bluesniping - Wikipedia
Bluebugging - Wikipedia

Last edited by PRR; 10th June 2021 at 08:25 PM.
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Old 10th June 2021, 08:55 PM   #224
joensd is offline joensd  Germany
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Quote:
Originally Posted by knauf1919 View Post
I wanted to do something practical before I could give an objective answer. Looks like I can't find time to do that.
Sorry if my writing wasnŽt clear.
Please go ahead, IŽd love to hear your opinion, anytime.
BR
Jens
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Old 10th June 2021, 10:35 PM   #225
rpi is offline rpi  United States
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Quote:
Originally Posted by joensd View Post
Your project sounds interesting BTW.
You should document it here!
I have a Raspberry in some crate thats collectin dust;-)
I have posted some details in another thread. Here is just top level design:
https://www.diyaudio.com/forums/atta...-class-amp-jpg
Instead of O2 I'll use the amp from this thread.

The audio signal (USB) will come to that integrated amp from the digital source which is also based on Raspberry Pi:
NAS + Streamer
I'll use the same type of enclosure and display.
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Old 12th June 2021, 06:40 PM   #226
fidodido is offline fidodido  Netherlands
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Made a new layout (100mmx70mm) With onboard power supply (CRC and LM317)

Still listening to my breadboard version, sounds great for such a simple and clean design
Attached Images
File Type: jpg headphone.jpg (404.0 KB, 88 views)

Last edited by fidodido; 12th June 2021 at 06:57 PM.
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Old 12th June 2021, 08:19 PM   #227
joensd is offline joensd  Germany
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Quote:
I have posted some details in another thread....
Thank you very much. Your system is really nice. Love the detail, passion and even documentation you put into it!
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Old 12th June 2021, 08:25 PM   #228
BucketInABucket is online now BucketInABucket  Hong Kong
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Dammit I can't wait for my own boards to arrive! So excited to make it
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Old 13th June 2021, 10:47 AM   #229
widea is offline widea  Netherlands
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I finally made the amplifier on two perfboards.

Although the frequency range is now limited I like to keep connections on the pcb as short as possible, a bit point to point, with the 330pF capacitor close to the BC560C. I tend to approach this as a HF circuit. However in this case I made the connections not too short to leave some room for adjustments if needed.

The three resistors at the emittor of the TIP41C get hot. I probably have to get used to that as I only made opamp based amplifiers before. I lifted these resistors of the board.

The heatsink for the TIP41C is small but it may help cooling it down. It only gets slightly warm.

I also lifted the heatsink a bit of the perfboard by putting a metal ring between the heatsink and the perfboard.
Attached Images
File Type: jpg One top resize.jpg (697.0 KB, 57 views)
File Type: jpg One bottom resize.jpg (712.5 KB, 55 views)
File Type: jpg Both top resize.jpg (662.6 KB, 56 views)

Last edited by widea; 13th June 2021 at 11:00 AM.
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Old 13th June 2021, 12:02 PM   #230
knauf1919 is offline knauf1919  Europe
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How many watts do those resistors have? Measure the voltage drop on them and determine the exact power.
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