QUASI Amplifier for Beginners

[desertstorm]

APEX 550W

SIR, WIL THANK'S, as of now no available 220ac. pri. 30-0-30 sec. here in my place. i have 220/ 50-0-50 10A TRANSFORMER I can use this one for APEX 550W which is 65V is required power supply. pls sir i need your advise..

thank you sir willy and more power...

 

[wiljj78]

SIR, WIL THANK'S, as of now no available 220ac. pri. 30-0-30 sec. here in my place. i have 220/ 50-0-50 10A TRANSFORMER I can use this one for APEX 550W which is 65V is required power supply. pls sir i need your advise..

thank you sir willy and more power...

I suggest you to build SR200 or B500 for your 50-0-50 transformer...
Regards,

 

[desertstorm]

apex550w

thank you so much sir, willy more power to you sir.

 

[yehan]

how to eliminate small hum, for this quasi amplifier pls help..thanks in advance

 

[lyubcho88]

Hi all,

Here is my version of QUASI amplifier with current protect and some changes of values.
schematic
https://www.dropbox.com/s/egkgh82fsasb8yi/schematic +-52V.PNG
Board
https://www.dropbox.com/s/jvfugcho97mzmio/QUASI super mini Layout.PNG
PCB for Print
https://www.dropbox.com/s/itv3qlde2yzn7jt/QUASI super mini.pdf
And some of my projects with this circuit
https://www.dropbox.com/s/ugq9yguiqn4nkts/26012012616.jpg
QUASI Amplifier 2x180W
QUASI amplifier 2x180W | DIY Projects
Active Speakers with QUASI amp
??????? ?? ? LW1200 | DIY Projects
DIY SUB-woofer amplifier monoblock
| DIY Projects
QUASI Amp 2x180W peak power
QUASI amp 2x180W peak power | DIY Projects

BR,
Lyubo

 

[masood]

dear all,;
how can i read ms files/i mean by which software
thanking u

 

[apexaudio]

BX100

Class B hi-fi amplifier

 

[circuit bunny]

Good day Mr.APEX GOOD LUCK and thanks for your very informative posting...

 

[circuit bunny]

thanks Mr.APEX i will try to build this..

 

[Jsixis]

Fisherman told me fishing isn't cost effective hoby, better buy fish

very true if you are hungry

 

[masood]

Hi all,

Here is my version of QUASI amplifier with current protect and some changes of values.
schematic
url][https://www.dropbox.com/s/egkgh82fsasb8yi/schematic%20%2B-52V.PNG[/url]
Board
https://www.dropbox.com/s/jvfugcho97mzmio/QUASI super mini Layout.PNG
PCB for Print
https://www.dropbox.com/s/itv3qlde2yzn7jt/QUASI super mini.pdf
And some of my projects with this circuit
https://www.dropbox.com/s/ugq9yguiqn4nkts/26012012616.jpg
QUASI Amplifier 2x180W
QUASI amplifier 2x180W | DIY Projects
Active Speakers with QUASI amp
??????? ?? ? LW1200 | DIY Projects
DIY SUB-woofer amplifier monoblock
| DIY Projects
QUASI Amp 2x180W peak power
QUASI amp 2x180W peak power | DIY Projects

BR,
Lyubo

dear sir
where is the board of your first schematic url][https://www.dropbox.com/s/egkgh82fsasb8yi/schematic%20%2B-52V.PNG[/url]
thanks

 

[lm324]

Hi DJK,

Post schematic if possible.

Thanks.

Roger.

 

[djk]

"Post schematic if possible."

Same basic schematic, skip the FET, mount the bias transistor on the heatsink with the outputs.

Use high voltage parts everywhere.

You would need to make the board, it is no longer available for $6.

If doing a new board layout I would add anothe pad to the 2nd voltage amplifier and its current source, that way you could use the MJE340/350 pair, as well as the MPUS10/U60 that I used (unavailable), and the 2N3440/2N5415 (a common industrial part). 2N54xx/2N55xx parts for all the small plastic types.

 

[masood]

i asked this layout sir.

dear nazirdigi,
i want to make this pcb by toner tranfer method.can you send me that pcb image in reverse type thanking u.urs masood

 

[masood]

Quasi complementary amplifier based on old Dynacord. For begginers Class B without adjust.

dear apex,
plz send me pcb image by which i can make by toner tranfer method.thaniking u.

 

[masood]

Quasi complementary amplifier based on old Dynacord. For begginers Class B without adjust.

dear apex,
in circuit input electrolytic cap is 2.2and 100micro farad respectively,but in component plan there is 1 micro and 47 micro farad what is right.regards

 

[mharko]

Originally Posted by apexaudio View Post
Quasi complementary amplifier based on old Dynacord. For begginers Class B without adjust

Hi Mr Mile

That model was based?
Thank you

 

[masood]

Quasi complementary amplifier based on old Dynacord. For begginers Class B without adjust.

dear sir
transistor bc 546 is 80v trans.,bc547 is 60v trant. plz give me the equivalen of bc546 thanks

 

[lexy]

DUS = 1N4148
Use this pcb as start point and AX11 schematic with MJ15003/15004 in output... and you will have nice smal PA amp with overcurrent protect (BC546, BC556, 1k, 470R...)

hello sir can you share the file of it to me here's my email add ...[EMAIL="a.buyo@yahoo.com.ph"/EMAIL]

thanks in advance

 

[masood]

RE-SIZED.
if anybody need PDF pls ask. I'll share.

both are mje350