Hi gxcabin, I changed my 620P to 470p i am sure 330p will also be fine. -3db is around 100Khz with 470p.
As soon as i have it up and running i will do tests with the oscilloscope and check wave forms. i might then leave out 100P or make it higher value.
Thanks!
As soon as i have it up and running i will do tests with the oscilloscope and check wave forms. i might then leave out 100P or make it higher value.
Thanks!
Hi
I am doing temperature testing on the heatsinks i want to use.
I am currently using a bench setup with +-30V supply
No load connected , input shorted:
+-30V 1A per voltage rail
Devices = 38C
+-30V 1.5A per voltage rail
Devices = 54C heatsink = 39C
+-30V 1.6A per voltage rail
Devices = 61C heatsink = 44C
I only waited about 10 minutes between tests so heatsink will probably heat up much more.
It looks like with the heatsink size i have selected i am going to have to settle for about 1.5 or maybe slightly lower current per voltage rail. 750mA per device.
My plan is to run +-35V Dc rails ,I do realise that this will puch up the heat a bit more.
gxcabin , will the circuit work fine with +-35V rails?
I am doing temperature testing on the heatsinks i want to use.
I am currently using a bench setup with +-30V supply
No load connected , input shorted:
+-30V 1A per voltage rail
Devices = 38C
+-30V 1.5A per voltage rail
Devices = 54C heatsink = 39C
+-30V 1.6A per voltage rail
Devices = 61C heatsink = 44C
I only waited about 10 minutes between tests so heatsink will probably heat up much more.
It looks like with the heatsink size i have selected i am going to have to settle for about 1.5 or maybe slightly lower current per voltage rail. 750mA per device.
My plan is to run +-35V Dc rails ,I do realise that this will puch up the heat a bit more.
gxcabin , will the circuit work fine with +-35V rails?
hi,
1.5A @ 30V is just 24W/device.
A 250W device (mj15003/4) de-rated for temperature will easily handle this idling power and drive an 8ohm load.
Try replacing the 250W To3 with a plastic packaged 150W To247 device and your amplifier might complain.
1.5A @ 30V is just 24W/device.
A 250W device (mj15003/4) de-rated for temperature will easily handle this idling power and drive an 8ohm load.
Try replacing the 250W To3 with a plastic packaged 150W To247 device and your amplifier might complain.
Hi andrew
I am using the plastic devices as they are mounted directly on this pc board just as in gxcabin's pictures.
mjl21194 and mjl21193 x 2
My question is will this design work fine with +-35Vdc if i keep them around 55C with 1.4 to 1.5A bias (minus the small other loads on the board) per voltage rail.
room temp was just under 25C.
I am using the plastic devices as they are mounted directly on this pc board just as in gxcabin's pictures.
mjl21194 and mjl21193 x 2
My question is will this design work fine with +-35Vdc if i keep them around 55C with 1.4 to 1.5A bias (minus the small other loads on the board) per voltage rail.
room temp was just under 25C.
Last edited:
May the normal work, but is not the optimum condition.
The operating temperature is very normal in 70 degrees.😀
Ni hao peng you, zhege hen piaoliang!
shun bian shuo yi ju, ni jiao shenme mingzi, wo jiao 'maikeer'. 🙂
Cheers Michael
Ni hao peng you, zhege hen piaoliang!
shun bian shuo yi ju, ni jiao shenme mingzi, wo jiao 'maikeer'. 🙂
Cheers Michael
You will Pinyin?😀
Hi ABIN
Those heatsink are from conrad australia
with retail price @ US$ 80 each
some diyer want to use this for ksa 100
someone there sold it to me US$ 70 for TWO
with shipping @ US$ 75 to here, good price !
oh yes what is the difference between test
and perfect edition PCB
i think you must start to sell the board in
commercial sector > Swap Meat Area
try to send it by registered post in post
office, ask too how much shipment for
two or four boards to america, aussie,
europe & new zealand, india so you
can estimate the shipping cost
if you send by EMS will make a lot
of people unhappy / cancel to buy
Oh yes if CeeVee build this, i think he will finish
build it just in two hours, how are u ceevee ?
best regards, jeffry
Those heatsink are from conrad australia
with retail price @ US$ 80 each
some diyer want to use this for ksa 100
someone there sold it to me US$ 70 for TWO
with shipping @ US$ 75 to here, good price !
oh yes what is the difference between test
and perfect edition PCB
i think you must start to sell the board in
commercial sector > Swap Meat Area
try to send it by registered post in post
office, ask too how much shipment for
two or four boards to america, aussie,
europe & new zealand, india so you
can estimate the shipping cost
if you send by EMS will make a lot
of people unhappy / cancel to buy
Oh yes if CeeVee build this, i think he will finish
build it just in two hours, how are u ceevee ?
best regards, jeffry
Attachments
Last edited:
oh yes
how big voltage near relay
i need to buy capacitor
for 220uf, 47uf & 4,7uf
about your bridge rectrifier
how much price for this ?
another picture please
best regards, jeffry
how big voltage near relay
i need to buy capacitor
for 220uf, 47uf & 4,7uf
about your bridge rectrifier
how much price for this ?
another picture please
best regards, jeffry
Please send me a PM with price and other details for 2 boards delivered to Lisbon, Portugal.
CV
I applied for the MSN account, has the interest friend please to add me, gxabin@live.cn
Also has my mailbox: 47948496@qq.com
Hi! Pocoyo
Hi ABIN
Those heatsink are from conrad australia
with retail price @ US$ 80 each
some diyer want to use this for ksa 100
someone there sold it to me US$ 70 for TWO
with shipping @ US$ 75 to here, good price !
Is the good price.
oh yes what is the difference between test
and perfect edition PCB
PCB returns to upload the picture to look to you.
i think you must start to sell the board in
commercial sector > Swap Meat Area
try to send it by registered post in post
office, ask too how much shipment for
two or four boards to america, aussie,
europe & new zealand, india so you
can estimate the shipping cost
if you send by EMS will make a lot
of people unhappy / cancel to buy
Thanks!
Oh yes if CeeVee build this, i think he will finish
build it just in two hours, how are u ceevee ?
？？？？
Hi ABIN
Those heatsink are from conrad australia
with retail price @ US$ 80 each
some diyer want to use this for ksa 100
someone there sold it to me US$ 70 for TWO
with shipping @ US$ 75 to here, good price !
Is the good price.
oh yes what is the difference between test
and perfect edition PCB
PCB returns to upload the picture to look to you.
i think you must start to sell the board in
commercial sector > Swap Meat Area
try to send it by registered post in post
office, ask too how much shipment for
two or four boards to america, aussie,
europe & new zealand, india so you
can estimate the shipping cost
if you send by EMS will make a lot
of people unhappy / cancel to buy
Thanks!
Oh yes if CeeVee build this, i think he will finish
build it just in two hours, how are u ceevee ?
？？？？
Hi Abin
i look once again some schematic, bom jan and pinkmouse & pcb
i realise there isnt 2pcs X 22uf / 16v in your board
i give you jan & al (pink mouse) BOM (build of material)
Jan Dupont - Pavel Dudek give this 22uf on the board after a long
discussion. Even didnt look at the bom there is 2 pcs X 22uf / 16 v
on AL Boards
in ksa 100 thread i look they change this electrolyt 22uf/16 to mkp
1 uf (mundorf Mcap)
my question is
- why you remove this caps ?
- if i want to use this caps where the best place for it ?
i look once again some schematic, bom jan and pinkmouse & pcb
i realise there isnt 2pcs X 22uf / 16v in your board
i give you jan & al (pink mouse) BOM (build of material)
Jan Dupont - Pavel Dudek give this 22uf on the board after a long
discussion. Even didnt look at the bom there is 2 pcs X 22uf / 16 v
on AL Boards
in ksa 100 thread i look they change this electrolyt 22uf/16 to mkp
1 uf (mundorf Mcap)
my question is
- why you remove this caps ?
- if i want to use this caps where the best place for it ?
Attachments
- Status
- Not open for further replies.