Hi everybody, it's about this one scheme - radically simple and worked.I build a prototype (with major changes in the power supply,and minor changes in the scheme)and have questions :
- what do exactly the connection between R2 and R3 - it works when R2 is directly grounded (i already tested it)?
- better transistors replacement , i mean BD135/BD136 (respectively BD139/140)?
Thanks in advance !
- what do exactly the connection between R2 and R3 - it works when R2 is directly grounded (i already tested it)?
- better transistors replacement , i mean BD135/BD136 (respectively BD139/140)?
Thanks in advance !
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Having R2 returned to the top of R3 increases the input impedance a little (bootstrapping) because R3 will have a similar AC voltage present as compared to the input.
The amp should work with either connection method.
The amp should work with either connection method.
1. Anything advertised as "ultimate" probably isn't.
2. When a circuit with both AC input and output coupling is introduced as direct-coupled, the best course of action is "eject".
2. When a circuit with both AC input and output coupling is introduced as direct-coupled, the best course of action is "eject".
If course not. It is just "good old classic".
Sorry about that, the introduction isn't mine .
O ja. I have already ejected ... all op amp's 🙂. What about all caps "inside the op amp's" - you can't remove them.
Believe me, i already tested "cmoy" circuit, rod elliott headphone amp - Headphone Amplifier ,
another circuit similar like yours, with "diamond output buffer" - http://blog.audioworkshop.org/diamond-buffer-headphone-amplifier/ , and few more circuits with op - amp's . They are pretty good , with ultra low THD, precise, detailed etc... But, after one hour listening, i feel myself tired and i want to put down my headphones. That's not happening with this simple circuit. That's way, i recommend - try it 🙂.
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