power amplifier circuits with jrc 4558 as pre amp neded. - Electronic Circuits Projects Diagrams Free

timothy · 17th August 2003, 09:40 PM

please can someone help me with power aplifier with the ic ''jrc 4558'' as the pre- amp input or transistors A558/C547 as the pre-am input..?? please i'll really be very grateful as i have been on this for several years. 300watts to 600watts. THANKS....!! you can please send it to: bestguy4u@coolchannel.com

Chippie · 20th August 2003, 08:39 PM

please can someone help me with power aplifier with the ic ''jrc 4558'' as the pre- amp input or transistors A558/C547 as the pre-am input..??

Could you be a little more specific with the kind of help you are looking for?

timothy · 21st August 2003, 01:16 PM

I HAVE TRIED SEVERAL TIMES TO BUILD A POWER AMPLIFIER. BUT AFTER BUILDING IT, THE POWER OUTPUT SIDE WORKS. BUT THE PRE-AMP SIDE DOES NOT WORK WELL. I USE THE IC; JRC4558. PLEASE CAN SOMEONE HELP ME WITH A GOOD CIRCUIT...???

Chippie · 21st August 2003, 02:13 PM

The preamp side should be fairly easy to do........

What are the specs for the power amp ?

Input sensitivity for full power for a start would help....

Is there any special equalization needed for the preamp or does it neeed a flat response from say 20hz to 20khz....

What signal source are you feeding into the preamp, this along with the power amp sensitivity will set the over all gain of the preamp section......

timothy · 21st August 2003, 08:01 PM

PLEASE I WOULD LIKE AN AMPLIFIER WITH BASE AND TREBLE. RIGHT NOW, I'M NOT REALLY TECHNICALY GOOD IN THE RANGE SPECIFICATIONS. BUT MOST IMPORTANT THING IT SHOULD HAVE GOOD RESPOUNSE AND NOT FLAT IN TONE. BUT PLEASE MOST IMPORTANT, IT SHOULD HAVE A POT VOLUME FOR A VERY HIGH GAIN OF ANY RANGE. THANKS FOR YOUR CONCERN....!!!!

Chippie · 25th August 2003, 11:03 PM

You are still not specific with the details............

A tone control circuit is fairly easy to assemble using an op amp, but again I stress the need for more info.........no one can help if you dont help us!

efren sabio · 20th August 2004, 09:09 AM

Hi Tim,

I was looking for 'datasheet 4558' when Yahoo steered me to here, and
now I'm a member 1 minute old!

I'm currently fixing a channel of a mic/line mixer which uses the
opamp 4558. This is a dual opamp IC, an improved 741 type opamp.
This IC has been used in guitar and bass amps.

Your power amp, PA, does it use the 4558 as an integral part of the
PA circuit, or does it comes before the PA itself? You see, some designs
do use an IC opamp as 1st stage of the PA. If your 4558 has a capacitor
connecting to the PA then it's not the 1st stage of your PA and this is
much easier to debug.

Efren

. channel

hotwaterwizard · 25th August 2004, 03:41 AM

Here is a Datasheet

efren sabio · 9th September 2004, 11:55 AM

Thanks for the datasheet.
I just done fixing 5 channels of a mic mixer which uses the 4558 and
they all had the same bug: the 2nd opamp is used as comparator in
the overdrive/clip circuit and the opamp just couldn't take it. What's
more the 4558 is more expensive here than the 5532. So I tried the
5532 as replacement. It worked! Not only I fixed the bug but the
sound is better!

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17th August 2003, 09:40 PM	(permalink)
timothy	power amplifier circuits with jrc 4558 as pre amp neded. please can someone help me with power aplifier with the ic ''jrc 4558'' as the pre- amp input or transistors A558/C547 as the pre-am input..?? please i'll really be very grateful as i have been on this for several years. 300watts to 600watts. THANKS....!! you can please send it to: bestguy4u@coolchannel.com __________________ timothy

20th August 2003, 08:39 PM	(permalink)
Chippie	please can someone help me with power aplifier with the ic ''jrc 4558'' as the pre- amp input or transistors A558/C547 as the pre-am input..?? Could you be a little more specific with the kind of help you are looking for?

21st August 2003, 01:16 PM	(permalink)
timothy	I HAVE TRIED SEVERAL TIMES TO BUILD A POWER AMPLIFIER. BUT AFTER BUILDING IT, THE POWER OUTPUT SIDE WORKS. BUT THE PRE-AMP SIDE DOES NOT WORK WELL. I USE THE IC; JRC4558. PLEASE CAN SOMEONE HELP ME WITH A GOOD CIRCUIT...??? __________________ timothy

21st August 2003, 02:13 PM	(permalink)
Chippie	The preamp side should be fairly easy to do........ What are the specs for the power amp ? Input sensitivity for full power for a start would help.... Is there any special equalization needed for the preamp or does it neeed a flat response from say 20hz to 20khz.... What signal source are you feeding into the preamp, this along with the power amp sensitivity will set the over all gain of the preamp section......

21st August 2003, 08:01 PM	(permalink)
timothy	SPECIFICATIONS FOR THE AMPLIFIER. PLEASE I WOULD LIKE AN AMPLIFIER WITH BASE AND TREBLE. RIGHT NOW, I'M NOT REALLY TECHNICALY GOOD IN THE RANGE SPECIFICATIONS. BUT MOST IMPORTANT THING IT SHOULD HAVE GOOD RESPOUNSE AND NOT FLAT IN TONE. BUT PLEASE MOST IMPORTANT, IT SHOULD HAVE A POT VOLUME FOR A VERY HIGH GAIN OF ANY RANGE. THANKS FOR YOUR CONCERN....!!!! __________________ timothy

25th August 2003, 11:03 PM	(permalink)
Chippie	You are still not specific with the details............ A tone control circuit is fairly easy to assemble using an op amp, but again I stress the need for more info.........no one can help if you dont help us!

20th August 2004, 09:09 AM	(permalink)
efren sabio	Hi Tim, I was looking for 'datasheet 4558' when Yahoo steered me to here, and now I'm a member 1 minute old! I'm currently fixing a channel of a mic/line mixer which uses the opamp 4558. This is a dual opamp IC, an improved 741 type opamp. This IC has been used in guitar and bass amps. Your power amp, PA, does it use the 4558 as an integral part of the PA circuit, or does it comes before the PA itself? You see, some designs do use an IC opamp as 1st stage of the PA. If your 4558 has a capacitor connecting to the PA then it's not the 1st stage of your PA and this is much easier to debug. Efren . channel

9th September 2004, 11:55 AM	(permalink)
efren sabio	Thanks for the datasheet. I just done fixing 5 channels of a mic mixer which uses the 4558 and they all had the same bug: the 2nd opamp is used as comparator in the overdrive/clip circuit and the opamp just couldn't take it. What's more the 4558 is more expensive here than the 5532. So I tried the 5532 as replacement. It worked! Not only I fixed the bug but the sound is better!