Suzy, have you tuned in the snubber on the gates or is it a work from someone else? Never seen that before.
I remember many years ago when I was doing the original AEM6000 based amps with Hitachi/Renesas laterals, thinking that balancing slew rate would be a good thing, so I added capacitance to the n-fets gates. It’s something that’s caused oscillation in the later class G version of this amp.
Hi Suzy and thanks for the AEM6000 builds. Looking forward to tackling the soldering of the MELF resistors. I couldn't find the faston tab (used for power inputs & speaker outputs) on the BOM or your Blog. Could you provide some info on those?
Many thanks, Pete
Many thanks, Pete
They're a faston 110 connector, in 0.8mm (vs the more usual 0.5mm) thickness.
Here's the Female connector:
https://au.mouser.com/Connectors/Terminals/110-FASTON-Series/_/N-5g5u?P=1ywwwf4Z1yphpxn
And the male one that gets soldered to the PCB:
https://au.element14.com/amp-te-connectivity/63756-1/terminal-pcb-tab-1-4mm/dp/2841308
Here's the Female connector:
https://au.mouser.com/Connectors/Terminals/110-FASTON-Series/_/N-5g5u?P=1ywwwf4Z1yphpxn
And the male one that gets soldered to the PCB:
https://au.element14.com/amp-te-connectivity/63756-1/terminal-pcb-tab-1-4mm/dp/2841308
My kingdom for a dual jfet! (well... several actually 😆)
Does anyone - ideally someone down here in Australia - have a few spare jfets they might be willing to sell me? I'm unable to source in either SST404 or U404 from future electronics or elsewhere. 🙂
Does anyone - ideally someone down here in Australia - have a few spare jfets they might be willing to sell me? I'm unable to source in either SST404 or U404 from future electronics or elsewhere. 🙂
Thanks @pitbul 🙂 it does look like I can purchase the INF406 from mouser, although the unit cost before postage looks to be more than 5 times that of the SST404 from future electronics. Unless I'm doing something stupid and looking at bulk price?
Hi, I got a set of boards made a while back, and have finally gotten round to start building up the amp 100W amp, I'm excited to build a power amp again, it must be almost 20 years since the previous one.
The boards are beautiful, and I find that I'm enjoying soldering the mini-melfs more than I was prepared for. I have, however, found some puzzling inconsistencies between the stuffing diagrams, the parts list, and the schematic. I am sorry to sound so pedantic about this but I don't want to end up making mistakes that end up burning more parts than necessary. The boards are quite dense and compact and with parts on both sides of the board, I worry that I can easily make a mistake tracing the diagram. I hope that this is not only me mixing things up and making a fool out of myself.
In the stuffing diagrams, the big wirewound resistors are R18, R37, R40, R42, and R46. In the parts list - and on the schematic - the big resistors are R40-R43 and R46. So I'm guessing R18 and R37 on the stuffing diagram should have been R41 and R43. But they are not simple pairs that are switched around, In the schematic, R37 is not a big wirewound, but the gate resistor of Q20; in the stuffing diagram the gate resistor of Q20 is R39. In the schematic, R39 is the gate resistor of Q22. In the stuffing diagram, the gate resistor of Q22 seems to be labelled R43.
[A very minor inconsistency: The big film decoupling caps which are C23-C26 are C22-C25 in the parts list, but also C13, C15, C23, and C25 on the stuffing diagram but this doesn't create so much friction, since they aren't in conflict with other labels. ]
Could it be that the stuffing diagrams and the schematic/parts list are from two slightly different revisions that got mixed up? Maybe I am pointing out old news? I would appraciate it if someone has a pointer to a consistent set of design files.
Kind regards,
Erik
The boards are beautiful, and I find that I'm enjoying soldering the mini-melfs more than I was prepared for. I have, however, found some puzzling inconsistencies between the stuffing diagrams, the parts list, and the schematic. I am sorry to sound so pedantic about this but I don't want to end up making mistakes that end up burning more parts than necessary. The boards are quite dense and compact and with parts on both sides of the board, I worry that I can easily make a mistake tracing the diagram. I hope that this is not only me mixing things up and making a fool out of myself.
In the stuffing diagrams, the big wirewound resistors are R18, R37, R40, R42, and R46. In the parts list - and on the schematic - the big resistors are R40-R43 and R46. So I'm guessing R18 and R37 on the stuffing diagram should have been R41 and R43. But they are not simple pairs that are switched around, In the schematic, R37 is not a big wirewound, but the gate resistor of Q20; in the stuffing diagram the gate resistor of Q20 is R39. In the schematic, R39 is the gate resistor of Q22. In the stuffing diagram, the gate resistor of Q22 seems to be labelled R43.
[A very minor inconsistency: The big film decoupling caps which are C23-C26 are C22-C25 in the parts list, but also C13, C15, C23, and C25 on the stuffing diagram but this doesn't create so much friction, since they aren't in conflict with other labels. ]
Could it be that the stuffing diagrams and the schematic/parts list are from two slightly different revisions that got mixed up? Maybe I am pointing out old news? I would appraciate it if someone has a pointer to a consistent set of design files.
Kind regards,
Erik
Anything is possible, and I would not stuff component(s) about which you have any doubt at all.
Someone will chime in to help. Documentation is extremely difficult to debug, especially for free.
Someone will chime in to help. Documentation is extremely difficult to debug, especially for free.
Hi rayma, sorry if it got across the wrong way. I am not asking anyone to debug my problems for free - but if someone already has gone through the trouble and is willing to share, that would be excellent. If not, I'll happily do it and try to share my findings.
Kind regards,
Erik
Kind regards,
Erik
So my friend and I went halves in the BOM to build these amps.. He's much more skilled (and motivated) than me and has successfully soldered up the 50 watt and 100 watt versions (although hasn't tested the 100 watt boards yet). He did find the same as you however. I hope this diagram containing corrections assists. Hoping you can let us know if that covers off the inconsistencies before I build mine! 😂
Attachments
By the way Erik, would love to see some finished photos of your casework, heatsinks and wiring etc... Currently still wrestling with these choices myself! 😃
