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Pictures update
Pictures update
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An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
RAJ will send me boards to Studio Amplifier
In a couple of monthes i will be listening at them.
Yeeeesssss!!!
Carlos
In a couple of monthes i will be listening at them.
Yeeeesssss!!!
Carlos
gemini bridge amp
dear sir/mam,
hello to all, sorry for the thread jacking folks,I am planning to build the gemini bridge amp and I had a couple of question about the gemini bridge amp. I would like to ask the designer of the amp Dr. Bora if I can use it on a higher rail voltage, say 50V-70V +/-15A. (I would be paralleling more output transistor of course 😀 ) I love bridge amp, they make most out of the power supply and you can use low Vce transistors. Thanks a lot and have a nice day everyone.
best regards,
audiomachines
dear sir/mam,
hello to all, sorry for the thread jacking folks,I am planning to build the gemini bridge amp and I had a couple of question about the gemini bridge amp. I would like to ask the designer of the amp Dr. Bora if I can use it on a higher rail voltage, say 50V-70V +/-15A. (I would be paralleling more output transistor of course 😀 ) I love bridge amp, they make most out of the power supply and you can use low Vce transistors. Thanks a lot and have a nice day everyone.
best regards,
audiomachines
Re: gemini bridge amp
I hope it's not an SMPS with a 15A max limit!
where did the 15A specification come from?audiomachines said:
I hope it's not an SMPS with a 15A max limit!
hello andrewT,
oh sorry for the confusion, I had several "big"35Vac-0V-35Vac @20A per leg, 50Vac-0v-50Vac @15A per leg transfo lying around, I scavenge it from a junk shop I basically got it very cheap. I am going to build this amp from surplus parts I had in my shop (I had this habit of recycling electronic parts 😀 ) If my understanding is correct about bridge amp (well according to crown audio white paper on grounded bridge topology), It would be able to deliver theoretical 160v p-p to the load from a +/- 40V power supply (as originally indicated from the schematic).
best regards,
audiomachines
oh sorry for the confusion, I had several "big"35Vac-0V-35Vac @20A per leg, 50Vac-0v-50Vac @15A per leg transfo lying around, I scavenge it from a junk shop I basically got it very cheap. I am going to build this amp from surplus parts I had in my shop (I had this habit of recycling electronic parts 😀 ) If my understanding is correct about bridge amp (well according to crown audio white paper on grounded bridge topology), It would be able to deliver theoretical 160v p-p to the load from a +/- 40V power supply (as originally indicated from the schematic).
best regards,
audiomachines
35Vac 20A will give you approx +-50Vdc and a maximum continuous output of about 10A.
The 50Vac 15A ~75Vdc and ~7.5A.
The short term overloaded capability of both these transformers could well be over double the continuous current but at a lower supply voltage. The peak demand of the amplifier will come from the smoothing capacitance, not from the transformer. The transformer has to recharge the smoothing caps when the mains voltage is high enough to allow this.
The +-40Vdc PSU is likely to give 35Vpk into a high load impedance and maybe as low as 30Vpk into ~4r0.
These when bridged will give about 60Vpk (120Vpp but no one specifies this figure unless trying to deceive someone) into ~8r0. This would be ~225W into 8ohm.
The 50Vdc supply should go to about 400W into 8ohm and the 75Vdc supply about 800W into 8ohm.
All of these bridged amps will need capacitance to drive a 4ohm load, allow plenty of money for this.
The 50Vac 15A ~75Vdc and ~7.5A.
The short term overloaded capability of both these transformers could well be over double the continuous current but at a lower supply voltage. The peak demand of the amplifier will come from the smoothing capacitance, not from the transformer. The transformer has to recharge the smoothing caps when the mains voltage is high enough to allow this.
The +-40Vdc PSU is likely to give 35Vpk into a high load impedance and maybe as low as 30Vpk into ~4r0.
These when bridged will give about 60Vpk (120Vpp but no one specifies this figure unless trying to deceive someone) into ~8r0. This would be ~225W into 8ohm.
The 50Vdc supply should go to about 400W into 8ohm and the 75Vdc supply about 800W into 8ohm.
All of these bridged amps will need capacitance to drive a 4ohm load, allow plenty of money for this.
well I got some n.o.s. western electric caps @ 22,000uF/63V which is larger than a beer can, I had 8 of these, 4pcs. elko caps @ 10,000uF/100V, 6pcs. nippon chemicon @15,000uF/80V. I got these from an industrial supply that sell transport train parts. Probably I am gonna need some soft start ckt if I am gonna use these caps.
best regards,
audiomachines
best regards,
audiomachines
Condolance massage
My hearthiest condolence message to Dr.Bora.
For his lost of his mother yesterday.
May her soul rest in peace
Raj.
My hearthiest condolence message to Dr.Bora.
For his lost of his mother yesterday.
May her soul rest in peace
Raj.
I am sorry Bora.... hard moment in your life
Few years ago gone your Dad....now your Mum.
I have lost them too Bora...no one scape from this certain destiny fact.
My respect and condolences.
Carlos
Few years ago gone your Dad....now your Mum.
I have lost them too Bora...no one scape from this certain destiny fact.
My respect and condolences.
Carlos
Hello
Sorry to hear that Dr Bora .
May God be with hear and with you to in these difficult time so you can go on on your life .
Greetings
Sorry to hear that Dr Bora .
May God be with hear and with you to in these difficult time so you can go on on your life .
Greetings
Dr. Bora,
my prayers, may her soul rest in peace and a promise of eternal life....
audiomachines
my prayers, may her soul rest in peace and a promise of eternal life....
audiomachines
Hi Dr Bora
You have some very good looking designs, congrats.
In another thread some time back you showed some interesting current sources, could you elaborate on your work in this area. I particular like the bjt current source you showed, could you explain the benefit and the maths behind it, sonic advantages. I have wanted to start a thread on ccs but abstained because of the behaviour of some members but there are also other interested members.
You have some very good looking designs, congrats.
In another thread some time back you showed some interesting current sources, could you elaborate on your work in this area. I particular like the bjt current source you showed, could you explain the benefit and the maths behind it, sonic advantages. I have wanted to start a thread on ccs but abstained because of the behaviour of some members but there are also other interested members.
Hi Dr Bora
You have some very good looking designs, congrats.
In another thread some time back you showed some interesting current sources, could you elaborate on your work in this area. I particular like the bjt current source you showed, could you explain the benefit and the maths behind it, sonic advantages. I have wanted to start a thread on ccs but abstained because of the behaviour of some members but there are also other interested members.
You have some very good looking designs, congrats.
In another thread some time back you showed some interesting current sources, could you elaborate on your work in this area. I particular like the bjt current source you showed, could you explain the benefit and the maths behind it, sonic advantages. I have wanted to start a thread on ccs but abstained because of the behaviour of some members but there are also other interested members.