mr stewin
i do not know why but i can not open diysmps site.!!!!!!
may be it was damaged.
may be that site was filtrler in my country and internet isp.
thanks for your helping
yep, this circuit is used in smps(this case power supply based in a SG3525).
The operation is very simple:
the diode d1 is connected to some opamp (tl072 for example),configured as a comparator so that a greater variation in voltage at the output of MUR160, the comparator to disconnect the SG3525 through the optocoupler
I'll build today this amplifier, but with a power supply with +- 60V using
irf9640 and irf640... 😀
At exactly what I want to find stewin, the temperatures at which the transistors work since this circuit does not have the dead-time, as it is known amplifiers class d has the main feature of the low working temperature of power MOS-FET
Hi All,
What are appropriate substitutions for the 2n5551/2n5401 transistors. I've loads of bc556, 557 etc and bd139/140's at hand so can either be used instead?
What are appropriate substitutions for the 2n5551/2n5401 transistors. I've loads of bc556, 557 etc and bd139/140's at hand so can either be used instead?
Hi at all!
This is my pcb of this amplifier from Stewin project
I've a problem the output will feel very little in the speaker.
I'm using +-38V DC from project89 of Elliot sound (step up converter from 12V to +-40V), in the tl074 I've 4,60V, I've tried to change the 2,2k resistors with 1k but nothing has changed.
The toroid it's a 106-2 it's red on all the faces.
The speakers have 2ohm
This is my pcb of this amplifier from Stewin project
I've a problem the output will feel very little in the speaker.
I'm using +-38V DC from project89 of Elliot sound (step up converter from 12V to +-40V), in the tl074 I've 4,60V, I've tried to change the 2,2k resistors with 1k but nothing has changed.
The toroid it's a 106-2 it's red on all the faces.
The speakers have 2ohm
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stewin:
Yes..that r12...and tl074 has a very slow rise/fall time and that creates deadtime also.
abarth92:
tri this:
1.Inject signal directly into pin 2 at tl074.If this doesn't work try:
2.Disconnect speaker and conect 200 ohm load. Disconect R12 .Connect T1 and T2 comman base to to +40 volt and -40 volt with 4.7 kohm resistor.See if you have normal output swing(+vcc and -vcc).
Yes..that r12...and tl074 has a very slow rise/fall time and that creates deadtime also.
abarth92:
tri this:
1.Inject signal directly into pin 2 at tl074.If this doesn't work try:
2.Disconnect speaker and conect 200 ohm load. Disconect R12 .Connect T1 and T2 comman base to to +40 volt and -40 volt with 4.7 kohm resistor.See if you have normal output swing(+vcc and -vcc).
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Hi CPX, I haven't an oscilloscope to see the waveform for try the step 2!
I have tried to apply the signal into pin2 but i have a big boom from the speaker
I have tried to apply the signal into pin2 but i have a big boom from the speaker
abarth92 the amp works the way it is without modifications please check your soldering and components . i even posted pictures of my amp at diysmps
>>>>>and i have noted you are using single sided pls ground properly because the top layer connects ground (0vlts) to the rest of the board<<<<<<<<<<<<< when i used single sided i had use jumpers to make sure all ground planes are connected.
>>>>>and i have noted you are using single sided pls ground properly because the top layer connects ground (0vlts) to the rest of the board<<<<<<<<<<<<< when i used single sided i had use jumpers to make sure all ground planes are connected.
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Hey guys, just a small observation that may go unnoticed by many who will try to assemble and are not going to get, I hope you take this into consideration:
2n5551 transistor is different from 2n5551C, only the pins, see datasheets
2n5551 transistor is different from 2n5551C, only the pins, see datasheets
😱😱wow thanks that's why on eagle layout are different i thought the software had error 😀😀
abarth92:
You need only multimeter not scope to try point 2 in my message.
You have to verify if output goes to v+ rail and then to v- rail when T1 and T2 base goes to + 5 volts and to -5 volts.
You need only multimeter not scope to try point 2 in my message.
You have to verify if output goes to v+ rail and then to v- rail when T1 and T2 base goes to + 5 volts and to -5 volts.
Hello people, okay? I just set up my prototype in a proto-board. As I said I used a complementary pair (irf640 and IRF9640), although I'm not using a source of + - 60, but one of + - 25.
I'm impressed great sound quality I got, and how friends asked you guys post here some parameters that you guys have questions. First notice that I use an oscilloscope for PC, what do not cease to be a great tool and it got the values of the parameters.
Again, these are values that got in my equipment, using sinusoidal signal generator with a frequency of 1khz:
Power Supply: + - 25VDC (50Vdc).
Power (rms): 112.5 @ 8ohms
Sensibility: 0.8 V
Freq range: 20 to 18khz.
input impedance: 47kohms.
output impedance: 4ohms.
THD @ 1kHz: 0.18%
THD + n @ 1khz: 30.4%
even more
I'm impressed great sound quality I got, and how friends asked you guys post here some parameters that you guys have questions. First notice that I use an oscilloscope for PC, what do not cease to be a great tool and it got the values of the parameters.
Again, these are values that got in my equipment, using sinusoidal signal generator with a frequency of 1khz:
Power Supply: + - 25VDC (50Vdc).
Power (rms): 112.5 @ 8ohms
Sensibility: 0.8 V
Freq range: 20 to 18khz.
input impedance: 47kohms.
output impedance: 4ohms.
THD @ 1kHz: 0.18%
THD + n @ 1khz: 30.4%
even more
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