How would this circuit compare to a commercial amplifier such as Audiolab 8200A? I have the 8200A and wonder if I can improve on the sound quality with this design.
If you want improve on the sound quality go to SR200
@apexaudio
Will VU work with Quasi?
@nazirdigi
Nice! Can you share the pcb editable file of VU? I will only use it for one channel. TIA 🙂
Will VU work with Quasi?
@nazirdigi
Nice! Can you share the pcb editable file of VU? I will only use it for one channel. TIA 🙂
hi AndrewT
i will use mje15030/31
but i was wondering how my dj amp has bd139/40 with rail voltage 54 volt
they are forced air cooled but without heatsink. 😕
the amp is robust and drive 2 dual 15" cabinets.
dear sanju
i think that dj amplifier are huge ,1000watts and with mosfet transistors.these dj are 16 ohm 12 inches speaker.do you have knowledge about dj commercially available in market.khanks ur masood
Hi everyone. Here are some of my amps made by quasi scheme
more pics & information
QUASI amplifier 2x180W | DIY Projects
more pics & information
| DIY Projects
more pics & information
QUASI amp 2x180W peak power | DIY Projects
Regards

more pics & information
QUASI amplifier 2x180W | DIY Projects

more pics & information
| DIY Projects


more pics & information
QUASI amp 2x180W peak power | DIY Projects
Regards
@apexaudio
Will VU work with Quasi?
@nazirdigi
Nice! Can you share the pcb editable file of VU? I will only use it for one channel. TIA 🙂
This VU work with any amp without adjust.
I´d like to have it!RE-SIZED.
if anybody need PDF pls ask. I'll share.
@ lyubcho88
GREAT JOB DONE by the way,you did it really awsome!
thanks! 🙂
Thank You very much!
RE-SIZED.
if anybody need PDF pls ask. I'll share.
APEX550 PDF.
Thank You very much!
dear nazir,
is this protection pcb.thanks regard
that is power amp pcb.
that is power amp pcb.
dear sir
do you have this pcb with protection(pcb with relay)as i saw some where?
thanks.sorry for my bad english
Hi
Need to add a resistor of 0.33ohm/5W on the transistor 2N3773 or 2SC2922 (for Ucc=+/-70V) in the emitter of the negative branch of power supply.
Ceers😉!
dear sir
can i use these .22ohm2 or 3 watts resistors in place of 5 watts resistor.thanks your ever masood
The 0.22Ω in each individual transistor will be dissipating about 1W average power assuming 300W/4Ω with four pair of outputs, so a good quality 3W is probably adequate.
Remember that most resistor ratings are specified with a Delta T of 250°C, so a 3W part running at 1W will have a Delta T of 88.3°C above ambient. This will be over the boiling point of water if the amplifier is run at full power for any length of time, but it should be OK.
Remember that most resistor ratings are specified with a Delta T of 250°C, so a 3W part running at 1W will have a Delta T of 88.3°C above ambient. This will be over the boiling point of water if the amplifier is run at full power for any length of time, but it should be OK.
Last edited:
Apex the output transistor it is applicable to add as many as I can? Example 10 pair how much power output. Thanks
- Home
- Amplifiers
- Solid State
- QUASI Amplifier for Beginners