DLH Amplifier: The trilogy with PLH and JLH amps

[alheiz]

Gerber file

Hola

what is the complet pcb design DLH gerber file?
I want download or obtain some pcb


Hello Horacio,
Could something like this work?

regards
Prasi

 

[diegomj1973]

Hi.

I think several have made their designs and uploaded it to the thread. In fact, they are very good. I don't have my own PCB design to offer you.

Thanks for your interest in the amp.

Good luck with the construction of your project.

There is also another amp you could build, which is very tempting: The NEZ Amplifier. It operates under a different concept than the DLH, although it has its charm as well.

Regards

 

[vizion]

Hi, what is the power draw (watts) of this amp running push pull 3.88w @ 8 ohms ? Is it 60 watts ?

 

[diegomj1973]

Hi.

A quiescent current of 1 A would be necessary to be able to adjust to the two possible modes of operation (single ended or push pull). For this case, the total dissipation would be in the order of 30.87 W.

If you only want to operate in push pull mode, a little more than 0.5 A would be enough. For this case, the total dissipation would be in the order of 15.43 W.

Best regards

 

[Kokanee]

@ alheiz,

If you are looking for DLH Trilogy amp designed by Horacio Caminotti and the pcb designed by Prasi, I have 9 of these pcbs that I could ship to you. Let me know here or by PM if you are interested.

Regards,

Myles

 

[fredeb]

Hi Diego

I'd like to build your amp , and I did order Prasi pcb's as per post #320 DLH Amplifier: The trilogy with PLH and JLH amps .

Can I substitute IRFP250 for IRFP240 on this board without changing any values ? My local supplier is out of stock of IRFP240

I also got the Johnson/Gtose CapMX pcb's also layed out by Prasi . Juma's Easy-Peasy Capacitance Multiplier

 

[gaborbela]

Yes you can...

 

[ZAO]

Hi guys.
I've bought the dlh boards from pcbway.
Is there a quick guide to bias the amp with measure points, and wich pots to turn?
I really can't get it, newbie alert 😀

 

[gaborbela]

My advise to you use two DMM one to measure the DC offset and one to measure the current (Iq). Before you start please Use a 40 or 60W light bulb at start up, that help not to blow up the amplifier at power up! I will include a circuit for that. If everything fine at start up, no smoke or buzzing noise start to adjust the trimmers one by one slowly and you will see which one adjust the offset and which one the bias. I am totally of the picture with this amp, it was a long while since my last involvement.

 

[xrk971]

It’s a Class A amp so the lightbulb will glow when it’s working right and cause too much voltage drop. Mostly have your hand on the power switch to turn off if the current exceeds 5A. Turn off and investigate. You literally have 1-2 seconds to flip it off if there is problem. Important to set pots to a state of low bias current and work way up slowly.

 

[ZAO]

Thanks for all your help.
I will certainly do the lamp thing, probably put a 5a thermal switch to avoid problems 🙂

 

[fredeb]

If you post schematic here , someone may be able to advise as to whether pots should be turned clockwise or anti-clockwise to raise bias current .

 

[xrk971]

I think I left my pots in middle setpoint and started up there without problems. This amp brings back many fond memories of Sharpie layout home etched PCBs. 🙂 fun amp. Sounds great too.

 

[fredeb]

I have one month left of my 14hour day contract , then I want to build it too .

Is it worth doing this amp with the cap multi ? Any beast output device recommendations ?

 

[ZAO]

If you post schematic here , someone may be able to advise as to whether pots should be turned clockwise or anti-clockwise to raise bias current .

There you have it.
If you want to build it I have a lot of spare boards I've made 🙂

 

[fredeb]

Thanks for the offer , I have boards too . For the 2k5 pot I have a 2k2 , hopefully that is OK .

Looks like balanced input on schematic above .

 

[thimios]

Thanks for the offer , I have boards too . For the 2k5 pot I have a 2k2 , hopefully that is OK .

Looks like balanced input on schematic above .

Isn't a balanced input,IN-2 goes to the gnd through the R18=10ohm.
IN-1 is the + input.

 

[fredeb]

Thank you for clearing that up @thimios . So basically a ground lift ?

 

[alheiz]

View attachment 1072833

Ahí tienes.
Si quieres construirlo, tengo muchas tablas de repuesto que he hecho.🙂

Hola
Quiero un proyecto de bricolaje. ¿Compartir PCB?
ES necesario usar condensador de acople para la conexión de speaker?

 

[ZAO]

Hola!

Mi español no es lo mejor, pero si quieres unas placas me manda un message, tengo muchas 😉