400w DARLİNGTON AMPLİFİCATOR 2 ohm STABLE
- Thread starter erhan739
- Start date
vedmitra
Member
Hai Lira regards from Vedmitra Sharma, I want to start this project need your advice. 1. Can I put more darlingtons in parallal and how many. I know this is not going to increase output voltage but certainly current which can give ample power to drive subwoofers. I have made darlington circuits earlier and found the sound quality similar silky as of valve amplifiers.Please post your modifications in pdf format as I could not extract your zip format. if you wish you can post to my id that is vedmitraa@gmail.com
Lira
Member
Hi, If you drive 2ohm speakers thats no need for extra output transistors. If you drive 1ohm speaker you can put 4 more output transistors, but its not recomended use this amplifier in such that low impedance because the transistors will overheat an burn on very high inductive loads caused by big speakers.!!!:
Here are the files,
Best Regards
Lira
vedmitra
Member
Thanks Lira for your reply , though the amp can be build without circuit but it is amazing to see that the circuit of this amp has not been published.I will be grateful if circuit diagram can be published. As for output load the earlier versions of tip 100 watts circuits published by philips I tested them 4 pairs of darlington on dummy load of 1 ohm 280 watts + speaker and it worked undistorted for hours. and amazingly as in other circuits sound gets distorted if you put this kind of load there was not any distortion.one more question can we use this circuit in bridge mode and how. Waiting for your valuable reply Vedmitrasharma.
Lira
Member
Hi, I found the very first schematic of this amplifier, please note that the pcb has some different componets, wich is highly optimised to work with lower impedances. Although i not recomend using this amplifier on bridge, because of the high currents that returns to the transistors. It can easily done by using a pre stage with opamps with inverted phases one against the other, and put two boards in bridge.
Use this only on 8Ohms for subwoofers, but from my past testing experience of this amplifier, in bridge you will get a lot of distortions on mid high frequencies, and the circuit can oscilate easily on high inductive loads.
For higher output power you can use discrete amplifiers with the 2sc5200 and 2sa1943, it distorts less and can handle more power, Darlingtons are great when no more than 400w/ch are needed.
Be sure to check the ɥFe of all the darlingtons you have and chose the ones that have the same values, or almost the same to ensure the stability of the circuit.
Best Regards;
Lira
Use this only on 8Ohms for subwoofers, but from my past testing experience of this amplifier, in bridge you will get a lot of distortions on mid high frequencies, and the circuit can oscilate easily on high inductive loads.
For higher output power you can use discrete amplifiers with the 2sc5200 and 2sa1943, it distorts less and can handle more power, Darlingtons are great when no more than 400w/ch are needed.
Be sure to check the ɥFe of all the darlingtons you have and chose the ones that have the same values, or almost the same to ensure the stability of the circuit.
Best Regards;
Lira
Attachments
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schematic.jpg
vedmitra
Member
Thanks Lira, I am in for making this amplifier. soon i will post pictures of proccedure. at present I am busy refurbicating my workshop.Are you really in for big speakers .Here in Agra part time I supervise A speaker and box fabricating co.Have you designed any speaker more than 18" size.please contact. vedmitr Sharma
Lira
Member
About Big Speakes
I've built a 21' for subwoofer using a W-Horn custom box for a client this week, later i´ll show some pics
Best Regards
Lira
I've built a 21' for subwoofer using a W-Horn custom box for a client this week, later i´ll show some pics
Best Regards
Lira
Lira
Member
The speaker i sold last month with a custom made w-horn box, but the pcbs i have is here.
I will be building another 21' speaker in a couple of weeks
Best Regards
Lira
Lira
Member
Here, everything you need
First the link for proteus 7.8 sp2
http://www.4shared.com/rar/9bJV0aqb/proteus_78_sp2.html
and all the files attached on this post!
Suit yourself!
If you need anything let me know
Best Regards
Lira
First the link for proteus 7.8 sp2
http://www.4shared.com/rar/9bJV0aqb/proteus_78_sp2.html
and all the files attached on this post!
Suit yourself!
If you need anything let me know
Best Regards
Lira
