QUASI Amplifier for Beginners

[A square]

hi

A square/Jon, which one did you use; the schematic or the PCB? Judging on your QUASI 550W Amplifier project, it seem that you follow the schematic.

hell sir

i use schematic .....

thanx....

 

[Tekko]

This design should be ideal for a subwoofer amplifier, assuming it doesent chicken out below 50Hz.

 

[noobie]

Apex, can i use 2sc5200 for the drivers?, i have 10 pcs of these..

 

[apexaudio]

Apex, can i use 2sc5200 for the drivers?, i have 10 pcs of these..

You can use 2SC5200 as outputs.
Regards

 

[eesbiboi]

bridging

apex sir...,

i'd like to ask something...

how do i bridge amps like this without using an inverter or birdge buffer???...

tnx and regards...
ees...

 

[apexaudio]

apex sir...,

i'd like to ask something...

how do i bridge amps like this without using an inverter or birdge buffer???...

tnx and regards...
ees...

Yes, use this schematic for simple bridge.
Regards

 

[eesbiboi]

Yes, use this schematic for simple bridge.
Regards

thank you sir...

i see...a 22k resistor connects the two amps...
ahmmm...what is the idea behind???...
so i can implement it in any other amps that i may encounter...
please help...

tnx and regards...
ees...

 

[AndrewT]

22k at the input is to match the 22k in the NFB.

 

[eesbiboi]

22k at the input is to match the 22k in the NFB.

is it necessary to match the input and the feedback resistors???...why???...

so if i have 33k feedback i'd also use the same value at hte input to bridge the amp...

thanks...
ees

 

[AndrewT]

input bias currents

yes, it is very important.

Any schematic that shows different values should explain why it can be considered as a very rare exception.

 

[eesbiboi]

yes, it is very important.

Any schematic that shows different values should explain why it can be considered as a very rare exception.

ok thank you sir...

one more thing...
since i've been asking about bridging,
i'd like to know how grounded bridge topology differ from bridge tied load...
i ask this because somebody told me that his amp uses the said topology...
and i am very sorry i dont have the schema...

thanks...
ees

 

[apexaudio]

thank you sir...

i see...a 22k resistor connects the two amps...
ahmmm...what is the idea behind???...
so i can implement it in any other amps that i may encounter...
please help...

tnx and regards...
ees...

Simple, output of first amp is connect to inverting input of second.

 

[mihailo]

Apex550 almost finished. :-D

 

[mihailo]

And Apex ML3 tone control with STANDARD preamp...

 

[apexaudio]

Nice PCB with TO3 outputs on it, but can be smaler or you can add protect circuit.
What is 'standard preamp'?
Regards

 

[A square]

hi

And Apex ML3 tone control with STANDARD preamp...

hello sir nice work.....

 

[noobie]

i have a question is this the right value of 100n= 0.1/100 mylar/ 104 ceramic and
470=.00047/100 mylar/ 471 ceramic?

can you give a limiter circuit for this amp.

 

[apexaudio]

i have a question is this the right value of 100n= 0.1/100 mylar/ 104 ceramic and
470=.00047/100 mylar/ 471 ceramic?

can you give a limiter circuit for this amp.

For limiter see posts #179 and #181.
Regards

 

[mihailo]

Standard preamplifier is the name of Borivoje Jagodic stereo preamp.
This is schematic and PCB of it.
Regards

 

[apexaudio]

Standard preamplifier is the name of Borivoje Jagodic stereo preamp.
This is schematic and PCB of it.
Regards

I prefer dual pots for stereo preamp, see thread http://www.diyaudio.com/forums/solid-state/167363-mic-line-eq-preamps-4.html post #39.
Regards