Mic, Line, EQ... Preamps

[mathez]

bas amp

hi mile,
i have made thiss amp
,
sound good,the PSU 20Vac/5A..but when volume pot fully opened ,.the final TR(tip142+tip147) very hot,and less than 1minut,tip142+tip147 got damaged.why?

 

[smartx21]

Maybe someone finds this useful:
http://www.diyaudio.com/forums/solid-state/178333-2-speed-fan-controller.html
Regards,
Max.

 

[apexaudio]

hi mile,
i have made thiss amp
View attachment 199366 ,
sound good,the PSU 20Vac/5A..but when volume pot fully opened ,.the final TR(tip142+tip147) very hot,and less than 1minut,tip142+tip147 got damaged.why?

TIP142/147 must have heatsink.
Regards

 

[apexaudio]

Measure TP1,TP2 voltage, must be about 10mV for 20mA BIAS

 

[rakesh_sharma23]

This simple x-over work in range 20-100Hz, if you need this low pass instead 80-250Hz you can just use pot 2x50k instead 2x10k and sound will be same.
Regards

I have tried 50K pots but no improvement.. Even replaced the TL IC with two new ones, both purchsed from different vender... Still bass is not low as with the Lowpass circuit.

If any one else can try it.. may be all TL ICs can be faulty..

Waiting for reply from members...

Rakesh Sharma

 

[sudhir kumar]

Hi apex,
Please post a simple stereo 3way active crossover.

 

[rhodrich]

hi apex,

do you have pre-amp buffer that can drive several b500 amps of your? same us 1 input with 8 out.

thanks

 

[engel dela pena]

hi apex,

do you have pre-amp buffer that can drive several b500 amps of your? same us 1 input with 8 out.

thanks

​

b500 have balanced input,you can use parallel balanced input,(or through)
apex just confirm if it is ok up to eight?or need new buffer for eight?

 

[apexaudio]

​

b500 have balanced input,you can use parallel balanced input,(or through)
apex just confirm if it is ok up to eight?or need new buffer for eight?

In PA is usual to use active x-overs with amps, and there is output buffers on each channels.

 

[engel dela pena]

can you please share this buffer ckt.

 

[asia]

hi apex,

do you have pre-amp buffer that can drive several b500 amps of your? same us 1 input with 8 out.

thanks

sir apex,
can you please share sir a ckt of the said buffer,
please

 

[apexaudio]

sir apex,
can you please share sir a ckt of the said buffer,
please

Go to post #73.

 

[rhodrich]

In PA is usual to use active x-overs with amps, and there is output buffers on each channels.

yes apex if we used branded pa amp. if diy amp we dont link out, just input thats why we used buffer. say a single sub-out u cant just parallel the whole out with 8 amp. it would be better if every out going to diyamp sould have same input gain.maybe like this idea. pls help sir apex cant complete the crkt.

 

[engel dela pena]

yes apex if we used branded pa amp. if diy amp we dont link out, just input thats why we used buffer. say a single sub-out u cant just parallel the whole out with 8 amp. it would be better if every out going to diyamp sould have same input gain.maybe like this idea. pls help sir apex cant complete the crkt.

apex,
please,buffer ckt
regards

 

[sudhir kumar]

12dB/oct activ X-over with balanced input and outputs for subwoofer (LO),satelite(HI) or full-range(FR). X-over adjust 50-250Hz, and level for satelite (HI).

schematic ?

 

[andrewlebon]

hi sudhir
greetings check the active crossover at DIYSMPS DONT FORGET TO
JOIN THETHIN TRACK TO INPUT
THANKING YOU
ANDREWLEBON

 

[sudhir kumar]

I want to add a gain control in ML3 when using with dynamic microphone please suggest ?

 

[DAMANHURI]

100W Guitar Amp

Here 100W Guitar Amp
Guitar Amp or Bass Amp ?

 

[sudhir kumar]

hi apex,
your ML3 & cross over pcbs made by me through toner transfer method

 

[apexaudio]

Here 100W Guitar Amp
Guitar Amp or Bass Amp ?

Bass Guitar Amp