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| Evolve Power Amplifiers Guide |
Welcome to my homepage. My name is Shinichi-Kamijo. I am one amateur who creates the amplifier by the hobby.
A main content of my homepage is a report of my self-made power amplifier published in
the MJ magazine before.
I hope for imagination of everybody to be stimulated even a little by my homepage.
I challenged the use of various device to the final stage of the power amplifier.
And, My original circuits were designed by utilizing the characteristic of the devices.
My principle is not to change the sound with the amplifier.
The distortion and the noise have been decreased by devising the circuit as much as
possible.
I think that I should lower the output impedance of the amplifier, and drive the speaker
powerfully to obtain the high fidelity sound from the speaker.
The following pages have my result.
| Information | Schematics | ||
| Super triode
connection Ver.1 16A8 single ended. stereo. The super triode connection is a circuit which used the triode instead of the feedback resistance in the NFB amplifier. |
Amplifier | gif | |
| Power supplier | gif | ||
| Super triode
connection Ver.1 6BM8 single ended. stereo.1st model. This amplifier does not use the semiconductor at all. |
All circuits | gif | |
| Hybrid amp | gif | ||
| Super triode
connection Ver.1 6BM8 single ended. stereo.2nd model. The circuit of this 6BM8 amplifier is sophisticated more than the previous works. |
Amplifier(ZD) | gif | |
| Amplifier(CRD) | gif | ||
| Power supplier | gif | ||
| Super triode
connection Ver.2 6550 single ended. stereo. Ver.2 is a current feedback type though Ver.1 is a voltage feedback type. |
Amplifier | gif | |
| Power supplier | gif | ||
| Super triode
connection Ver.3 EL86 single ended push pull. stereo. Ver.3 is a method of raising the voltage amplification degree by lowering the rate of the feedback of Ver.2. |
Amplifier | gif | |
| Power supplier | gif | ||
| Super triode connection
Ver.3 KT90 single ended. stereo. This amplifier interstage is AC coupling composed of CR. |
All circuits | gif | |
| Super triode connection
Ver.4 idea. Ver.1 is a feedback to the grid. Also, Ver.2 is a feedback to the cathode. And, Ver.4 is a feedback to the anode. |
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| Super triode
connection Ver.5 EL34 double ended push pull. stereo. Ver.5 is a circuit where the inverting amplifier in two stages was added to Ver.4. And, the output stage is a cathode grounded amplifier. |
Amplifier | gif | |
| Power supplier | gif | ||
| Super triode
connection drive 6C33C-B single ended push pull OTL. stereo. 6C33C-B of the final stage is driven by the super triode connection of the minor loop NFB. Therefore, the output impedance falls, and the distortion has decreased. |
Whole composition | gif | |
| Amplifier | gif | ||
| Regulator | gif | ||
| Power supplier | gif | ||
| Timer, Protectoer | gif | ||
| Timing chart | gif | ||
| Ip
+ Isg outputs EL509 4parallel single ended
push pull OTL. stereo. This is a semi-transformerless method which operates in the AC 100V line. It is high power though it is a compact size. |
Amplifier | gif | |
| Power supplier | gif | ||
| Non-NFB, class A 2SB753/2SD843
complementary SEPP. The emitter resistance was abolished with the automatic bias control system. Therefore, the output impedance is low. |
All circuits | gif | |
| Water-cooled, non-NFB,
class A 2SB753/2SD843 complementary SEPP. Because the amplifier unit is put in Speakers box, the speaker cable is unnecessary. The system by this exactly drives the speaker directly. |
All circuits | gif | |
| MOS-FETdrive, non-NFB
2SB600/2SD555 complementary SEPP. |
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| Non-NFB class AB 2SJ49/2SK134
4parallel SEPP. stereo. Because the final stage by MOS-FET is inverted darlington circuit, the output impedance is low. |
All circuits | gif | |
| Voltage-mirror
2SJ113/2SK399 SEPP. stereo. Voltage mirror is a very strong minor loop NFB. |
Amplifier | gif | |
| Power supplier | gif | ||
| Ultra low on
resistance MOS-FET 2SK1380 single ended. stereo. Because Cascode stage is class B SEPP, a big output can be efficiently taken out. And, because VDS is extremely low though output stage is class A single ended which operates by a big idling current, the channel dissipation is small. |
Amplifier | gif | |
| Power supplier | gif | ||
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Links
http://plaza28.mbn.or.jp/~6bm8/englith/index.htm
http://www.gem.hi-ho.ne.jp/katsu-san/english_guide.html
Translator
http://world.altavista.com/tr
This web page was updated last on 11/29/07 15:55:50 +0900
