I'm so impressed with those on this forum that can look at a schematic, and with a bunch of parts, build an amplifier.....Even more impressed with those that have the schematic in their head!
I've built dozens of kit amplifiers. Knight Kit, Dynaco, Elco, Heathkit...Both for HiFi and Ham Radio. I even built a Heathkit Color TV back in the day!
Recently I built two amplifiers.....Different ends of the amplifier technology spectrum....A K-12G four tube 8wch amp and an ICE Power Class-D 200wch amplifier. But these were both kits and very easy to assemble. (Last year I built a Bob Latino ST120 Dynaco clone, and recently installed a total new prebuilt power supply into a First Watt F5v2)
My next goal is to build something "semi-kit".......I ordered two JHK 1969 module kits ( https://www.ebay.com/itm/393408084058 )
JLH 1969 Class A HIFI Amplifier Board MOT/2N3055
........Two huge heatsinks and I built an aluminum cabinet.
My question is Power Supply and Soft Start
I have a switching power supply on my bench. Can this be used to power the 1969 amp modules. Upside/Downside? Should I use something else?
3800W Anti-thunder Soft Start Power Supply Delay Board For Amplifier AC110V 100A
Am I correct in assuming that the soft start module goes before the power supply or after? (As you can see, I have an awful lot to learn...)
Any other advise on this journey would be appreciated......Thanks
I've built dozens of kit amplifiers. Knight Kit, Dynaco, Elco, Heathkit...Both for HiFi and Ham Radio. I even built a Heathkit Color TV back in the day!
Recently I built two amplifiers.....Different ends of the amplifier technology spectrum....A K-12G four tube 8wch amp and an ICE Power Class-D 200wch amplifier. But these were both kits and very easy to assemble. (Last year I built a Bob Latino ST120 Dynaco clone, and recently installed a total new prebuilt power supply into a First Watt F5v2)
My next goal is to build something "semi-kit".......I ordered two JHK 1969 module kits ( https://www.ebay.com/itm/393408084058 )
JLH 1969 Class A HIFI Amplifier Board MOT/2N3055
........Two huge heatsinks and I built an aluminum cabinet.
My question is Power Supply and Soft Start
I have a switching power supply on my bench. Can this be used to power the 1969 amp modules. Upside/Downside? Should I use something else?
DROK 48V Power Supply, AC 110V/220V to DC 0-48V 10A 480W Buck Converter
I just started reading about soft start modules and considering this... ( https://www.ebay.com/itm/402888316786 )3800W Anti-thunder Soft Start Power Supply Delay Board For Amplifier AC110V 100A
Am I correct in assuming that the soft start module goes before the power supply or after? (As you can see, I have an awful lot to learn...)
Any other advise on this journey would be appreciated......Thanks
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I might be wrong, but you don't need 'slow start' module for a switching PSU.
Most likely switching PSU might not even work correctly with it.
Slow start units are used for linear power supplies, with big electrolytic caps that need to be charged during start...
Switching PSU doesn't have big electrolytics.
Most of cheap switching PSUs might be adding lots of noise to the audio amp. Be careful selecting one suitable for audio.
Most likely switching PSU might not even work correctly with it.
Slow start units are used for linear power supplies, with big electrolytic caps that need to be charged during start...
Switching PSU doesn't have big electrolytics.
Most of cheap switching PSUs might be adding lots of noise to the audio amp. Be careful selecting one suitable for audio.
Thank you....I thought about that (see, I'm learning)......Not concerned with noise right now. This whole adventure is simply a learning tool....not a listening tool. Ultimately, I was to build a First Watt from scratch.....
for the jlh 69, a simple 15v 200VA power supply transformer is enough with a Pi power supply (CrC), the switching power supply is very good for testing but I never liked it on the 69 (for me).
Afterwards, it is necessary to refer to the writings of John Linsley Hood for the bias settings according to the impedance and the supply voltage.
Refer to the 8000 answer thread for the rest
Afterwards, it is necessary to refer to the writings of John Linsley Hood for the bias settings according to the impedance and the supply voltage.
Refer to the 8000 answer thread for the rest