dear Roender,
where You have found 2sa1360....is there any good replacement??
also have You considered to offer pcb's since they look that nice and at which price 🙂
regards
where You have found 2sa1360....is there any good replacement??
also have You considered to offer pcb's since they look that nice and at which price 🙂
regards
i can see in "rmi-fc100.zip" file that the pcb board of the amplifier is not completely finished ... do You have a completed board file in Eagle/Corel/*.jpg.... thanks....
🙂
also You have said that it is 90W/8ohm amplifier - it seems to me that it is a bit to much when we look at power supply voltage (but i am not an expert) - is there an error in typing related power or is it really 90W amp???
nice boards btw.
🙂
also You have said that it is 90W/8ohm amplifier - it seems to me that it is a bit to much when we look at power supply voltage (but i am not an expert) - is there an error in typing related power or is it really 90W amp???
nice boards btw.
sparkle said:
Sparkle,
The Eagle board is finished. You have to generate planes by pressing "Ratsnets" button.
Regarding power, it depends on suppply voltage. A it is now on published schematics, it is rated at 6ohm speaker impedance (monitor audio gold GS20) and not at 8 ohm.
The ampplifier, for Zout 6ohm, is SOA underpowered and can generate much more power if you don't care about class A dissipation.
Mihai
At +/-34V we have plenty of SOA margin and:
65W rms into 8ohm
87W rms into 6ohm
130W rms into 4ohm
260W rms into 2ohm (at the SOA limit)
For speakers with SPL over 90db it is more than enough.
65W rms into 8ohm
87W rms into 6ohm
130W rms into 4ohm
260W rms into 2ohm (at the SOA limit)
For speakers with SPL over 90db it is more than enough.
Mihai - you are my hero - now i have learned something new related Eagle.... perfect really..... thank You - i am happy as a morning bird..... 🙂
thank You....
related power---- so what is an optimum power supply voltage for best performance in your opinion and how much power i will get out of the amp - i have speakers that are 4-6ohm impedance (not really sure right now).....
thanks again
thank You....
related power---- so what is an optimum power supply voltage for best performance in your opinion and how much power i will get out of the amp - i have speakers that are 4-6ohm impedance (not really sure right now).....
thanks again
one more....
2s5200/2sa1943 - can they be used in Your design without altering the schematic?
(pinout is different - but regarding the sound and the behaviour of the amp would it be problematic to use those transistors)...
if so... i am thinking - maybe to use those transistors and to use maybe soem TO220 diodes and to connect them to the heatsink and between eachother as in the schematic...or simply to use vbe multiplier.... how about that... i do not have those nice njl transistors - they are hard to find here...but i have c5200 and a1943 more than enough....
any opinions ?
thanks for any reply.....
2s5200/2sa1943 - can they be used in Your design without altering the schematic?
(pinout is different - but regarding the sound and the behaviour of the amp would it be problematic to use those transistors)...
if so... i am thinking - maybe to use those transistors and to use maybe soem TO220 diodes and to connect them to the heatsink and between eachother as in the schematic...or simply to use vbe multiplier.... how about that... i do not have those nice njl transistors - they are hard to find here...but i have c5200 and a1943 more than enough....
any opinions ?
thanks for any reply.....
is there any other company that might sell NJLxxxx transistors except Digikey and Onsemi directly (Onsemi is not shipping to Croatia) and 25 pieces is a minimum order at Digikey...it is to much for me to order 25 of them....
??
thanks
??
thanks
Behind the excelent designer, there's an excelent daddy, a family man
that has a charming face, a kind expression and offering to be friend and to help me to construct his design.
I feel proud to have someone so good as Mihai is helping me.
He told me to substitute the LEDs into the simulator, by voltage sources...Fine!...he found solution to my problem
Clever folk.... i had not that idea.
Image is from Mihai and his wife Ioana...picture made in June of this year.
regards,
Carlos
that has a charming face, a kind expression and offering to be friend and to help me to construct his design.
I feel proud to have someone so good as Mihai is helping me.
He told me to substitute the LEDs into the simulator, by voltage sources...Fine!...he found solution to my problem
Clever folk.... i had not that idea.
Image is from Mihai and his wife Ioana...picture made in June of this year.
regards,
Carlos
Attachments
i have a question.....
i have found LED diodes on RS components catalogue....
red diode is L-383HDT - 2V/5mA (no. in catalogue 247-1274) and green one is L-383GDT 1.96V/5mA (no. in catalogue 247-1296)..........
would they be suitable....
one more question.... how is this amp behaving when driving "heavy" speakers.......
i have found LED diodes on RS components catalogue....
red diode is L-383HDT - 2V/5mA (no. in catalogue 247-1274) and green one is L-383GDT 1.96V/5mA (no. in catalogue 247-1296)..........
would they be suitable....
one more question.... how is this amp behaving when driving "heavy" speakers.......
Sparkle,
Regarding Light Emitting Diode, you could use any type you can find as long as the shape is rectangular, 2.5x5mm, and forward biased voltage is in the range of 1.96V to 2.1V. Try to not use very bright LEDs.
Buy 10-15 pieces and put all of them in series with a current limiter resistor, then bias all string at 5...6mA (see ASCII figure below).
(+30..40V)--|>||----|>||----|>||-- ... --|>||----|>||--[===]--(GND)
Measure forward voltage for all LEDs and match them two by two for left and right channel LTP and cascode current sources.
Mihai
Regarding Light Emitting Diode, you could use any type you can find as long as the shape is rectangular, 2.5x5mm, and forward biased voltage is in the range of 1.96V to 2.1V. Try to not use very bright LEDs.
Buy 10-15 pieces and put all of them in series with a current limiter resistor, then bias all string at 5...6mA (see ASCII figure below).
(+30..40V)--|>||----|>||----|>||-- ... --|>||----|>||--[===]--(GND)
Measure forward voltage for all LEDs and match them two by two for left and right channel LTP and cascode current sources.
Mihai
8 ohm - sensitivity bellow 86dB.....?!
one more question - can we see some output waveforms from the simulator - for example 20kHz output when driving the amp with square waveform in input....please 🙂
one more question - can we see some output waveforms from the simulator - for example 20kHz output when driving the amp with square waveform in input....please 🙂