There is not much to like or dislike about the amplifier, it is just a classic design that has been around for +50 years and is still built by enthusiasts every day - I wonder how many have been built since it was published in Wireless World. gannaji I bet you cannot look this up in Wikipedia 🙂
Last edited:
Member
Joined 2009
Paid Member
I can definitely say that I built one. 😀
http://www.diyaudio.com/forums/solid-state/3075-jlh-10-watt-class-amplifier-187.html#post2469219
Hi Guys,
New to this thread. I recently bought the Siliconray (JLH 2005) +- 22Vdc bipolar version but then realized thanks to this forum that the version is way too powerful for my need and heat dissipation..🙂, I then decided to adapt these free PCB for a less powerful version..i.e 9Wrms using +-12Vdc supply with an Iq of 1.5A, see schematics.
Can a good Samaritan have a look at my schematics and confirm if it all makes sense.
I intend to use a switching mode supply.
Thanks a lot.
Eric
New to this thread. I recently bought the Siliconray (JLH 2005) +- 22Vdc bipolar version but then realized thanks to this forum that the version is way too powerful for my need and heat dissipation..🙂, I then decided to adapt these free PCB for a less powerful version..i.e 9Wrms using +-12Vdc supply with an Iq of 1.5A, see schematics.
Can a good Samaritan have a look at my schematics and confirm if it all makes sense.
I intend to use a switching mode supply.
Thanks a lot.
Eric
Attachments
Last edited:
Hopefully a switching power supply with +- rails. I have seen cases where using two commercial switching supplies cause interference when their frequencies are not absolutely the same - just a warning.
Otherwise use a single 24V supply and create a virtual ground using two transistors, a diode and two resistors.
Otherwise use a single 24V supply and create a virtual ground using two transistors, a diode and two resistors.
Hi Nico,
Can you sketch a quick diagram of that virtual ground circuit. I would love to see how that is done.
Blessings, Terry
Can you sketch a quick diagram of that virtual ground circuit. I would love to see how that is done.
Blessings, Terry
Hi Nico,
No, it's not a +- power supply. I bought 2 power supply each rated 14Vdc, 4A which have their output floating and no ground pin on the AC side. I will simply create a center tap with both outputs since these are totally independant supply.
Rgds,
Eric
No, it's not a +- power supply. I bought 2 power supply each rated 14Vdc, 4A which have their output floating and no ground pin on the AC side. I will simply create a center tap with both outputs since these are totally independant supply.
Rgds,
Eric
That is the one. I have seen others that uses LM317/337 regulators maybe if you search for virtual earth on DIY audio. But the one above has worked for me for many years in all types of amplifier configs.