hi
good day all
sir apex can you redrowe this amp with 3 IRF540 and 3 IRF9540 please?
i want use it for 2 ohm load in my car
can i give 180 watt power in 2 ohm with +/- 40 v for my speaker?
thank you
Hello Terry
I think it might not hurt to change them to the ones you want, the thing that change is the leads position, also I think I read here that BD139 can be placed on the main larger heat sink then adjust R22 bias on my simulation respond really well at 1.5K it does lower the THD and respond really well in my diy opinion really nicely but R22 do not lower the value too much because it begins to drain more current from the rails supply
been mosfet they act as vampires if you provoke them jejejejejejeje
BF420 EBC VCEO 300V
KSC1845 ECB VCEO 120V
I think it might not hurt to change them to the ones you want, the thing that change is the leads position, also I think I read here that BD139 can be placed on the main larger heat sink then adjust R22 bias on my simulation respond really well at 1.5K it does lower the THD and respond really well in my diy opinion really nicely but R22 do not lower the value too much because it begins to drain more current from the rails supply
been mosfet they act as vampires if you provoke them jejejejejejeje BF420 EBC VCEO 300V
KSC1845 ECB VCEO 120V
Attachments
Last edited:
It is singing. I used the KSA992/C1845 in place of BF420/421 and BC550/560 in place of BC327/337. I also installed a 10K trimmer in place of the 4k7 resistor. I have the bias set to 50mA. It runs a little hot with the music turned up. Probably be wise to mount them on separate heatsinks but this is fine for testing.Square waves look good and it clips nice.
Be sure if you build this that you use BC556 fpr the LTP. I used BC546 initially because that was the label on the schematic but it was in error. They are PNP so must be BC556.
Blessings, Terry
Be sure if you build this that you use BC556 fpr the LTP. I used BC546 initially because that was the label on the schematic but it was in error. They are PNP so must be BC556.
Blessings, Terry
Attachments
https://www.youtube.com/watch?v=V6bneI2V44A
https://www.youtube.com/watch?v=ExyUOcLXVnM
this is my F100. now it has 300VA toroidal transformer and 10000+4700uF+1000uF per rail in power supply.
i tried it with smps,than with same torodial transformer and two "jars" but it lost it´s mid´s and hi tones. than i tried a solution big+medium+small uF in PSU and i have brougt back it´s mid and hi tones.
it has a lot of power,and it should have at least 500VA transformer to really hear what it can give.
anyway,even with this 300VA transformer it has more than enough power for listening in a living room.
i also transformed it from b-class to ab-class (multiturn instead 4k7) and it has about 80mA per pair (160mA in total for one channel). BD transistor is mounted over one output mosfet,connected to a PCB over triplet and that works good.
it is really pleasant amplifier to listen,with a lot of power,made by "easy" parts.
https://www.youtube.com/watch?v=ExyUOcLXVnM
this is my F100. now it has 300VA toroidal transformer and 10000+4700uF+1000uF per rail in power supply.
i tried it with smps,than with same torodial transformer and two "jars" but it lost it´s mid´s and hi tones. than i tried a solution big+medium+small uF in PSU and i have brougt back it´s mid and hi tones.
it has a lot of power,and it should have at least 500VA transformer to really hear what it can give.
anyway,even with this 300VA transformer it has more than enough power for listening in a living room.
i also transformed it from b-class to ab-class (multiturn instead 4k7) and it has about 80mA per pair (160mA in total for one channel). BD transistor is mounted over one output mosfet,connected to a PCB over triplet and that works good.
it is really pleasant amplifier to listen,with a lot of power,made by "easy" parts.
Attachments
Last edited:
God job! So far I have only tested it with a small PSU. +- 40vdc 300VA 6X4700uF. Sounds really good and plenty loud for indoor listening. I suppose if you want to use it in a club a bigger PSU would be warranted. I couldn't tell what frequencies your were testing with on your youtube video but they looked similar to what I see. Very square up to 20khz. 50khz starts getting rounded but that of course is way above human hearing.
I just etched the PSU and protection boards so I will try this PSU once I have it completed
Blessings, Terry
I just etched the PSU and protection boards so I will try this PSU once I have it completed
Blessings, Terry
Attachments
Terry i can't understand , isn't a good practice using two relays in signal path.
You must use either the protected power supply or the protection circuit.
Hi Thimios,
I don't plan to use both on the same amp. I just intend to build them. As usual I am just hoping to learn something. I have a few protection boards built including Valery's 21 century board. If I use one of these it will probably be the one that is PSU/protect combo board. One of these days I am going to have to stop soldering and build some cases. I don't know how I will ever decide which amps to use. I have a huge stack of awesome amps now.
Blessings, Terry
I don't plan to use both on the same amp. I just intend to build them. As usual I am just hoping to learn something. I have a few protection boards built including Valery's 21 century board. If I use one of these it will probably be the one that is PSU/protect combo board. One of these days I am going to have to stop soldering and build some cases. I don't know how I will ever decide which amps to use. I have a huge stack of awesome amps now.
Blessings, Terry
reverse parallel relay contacts
Borbely (or maybe some other renowned amplifier Designer) suggested using both poles of a DPDT relay to switch one speaker output.
But instead of using both poles in simple parallel connection, he suggested that one pole be connected in reverse and then paralleled.
Has anyone tried this?
Borbely (or maybe some other renowned amplifier Designer) suggested using both poles of a DPDT relay to switch one speaker output.
But instead of using both poles in simple parallel connection, he suggested that one pole be connected in reverse and then paralleled.
Has anyone tried this?
Guys if you have access to photoresist boards there isn't better way than photographic method.
Hi Andrew,
I will try to get to that. I too struggled for a long time trying to get good results with an iron. I finally saw a video on youtube where the guy used cheap shelving paper from the dollar store as the medium and it changed my life. I wish I could find it again so I could give a link. I don't know about the Dell printers. I couldn't get good results with a Brother printer either. I think the toner needs too high a heat or something. OS suggested HP so I just bought a cheap one, (P1102w) and it has worked fine. I have seen the results that Thimios gets from the Photo-etch boards and they are stellar but the boards are expensive. I get my boards from this guy and they are less than a dollar each, so it was important for me to learn how to do the toner transfer method. I'm happy with the results I get now and it literally takes less than an hour to etch and drill a board. Hopefully I will have time this week to put together some detailed info on it and I start a new thread about it. I has really added to my enjoyment.
Blessings, Terry
Terry here is the speaker protection schematic
Regards
Juan
Nice, but I suggest NE555 protect with thermal and overload circuit.
Regards
Hello mister Mile
I have this crazy idea of adding more pair mosfet for the F100 so far I simulated as it is with original schematic, " I know is not accurate because is software simulation"
do I need to do any further modifications to able to use 6 pairs of mosfet ?
don't mind about the name Atom it will be always be F100 just with more pairs ATOM 600 is just to identified my crazy ideas
The PCB is not completed yet I still hunting for errors = erratas
Regards
Juan
I have this crazy idea of adding more pair mosfet for the F100 so far I simulated as it is with original schematic, " I know is not accurate because is software simulation"
do I need to do any further modifications to able to use 6 pairs of mosfet ?
don't mind about the name Atom it will be always be F100 just with more pairs
ATOM 600 is just to identified my crazy ideas The PCB is not completed yet I still hunting for errors = erratas
Regards
Juan
Attachments
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.