Hi abin
can you give this focus bigger picture about this jumper
thank you (specially what you jumper below the board)
can you give this focus bigger picture about this jumper
thank you (specially what you jumper below the board)
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About the relay
If i got DC 24V relay, can i use them ?
which resistor i must change in the board ?
May use, you only need change 1K 2W that resistance, probably changes 360R, you test.
That resistor depends on your vcc and your relay coil resistance.
I will use +-35V and relay is 275ohm so I used 500ohm 2W. for a voltage drop of 12.9V over relay.
Dissipation across resistor will be just over 1W for my application. so 2W is needed.
My relay will close and work reliably between 70% and 170% of rated voltage.
I will use +-35V and relay is 275ohm so I used 500ohm 2W. for a voltage drop of 12.9V over relay.
Dissipation across resistor will be just over 1W for my application. so 2W is needed.
My relay will close and work reliably between 70% and 170% of rated voltage.
what is your relay coil resistance?
omron g2r 24V = 1k1 coil resistance
So for 42V dc (30Vac x 1.414) you will need 820ohm
This will then be 24.3V across relay
Yours will be different depending on coil resistance.
omron g2r 24V = 1k1 coil resistance
So for 42V dc (30Vac x 1.414) you will need 820ohm
This will then be 24.3V across relay
Yours will be different depending on coil resistance.
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i forgot the relay resistance 
im out of city now for office work
i will tell you later, i hope this help still available
im out of city now for office work
i will tell you later, i hope this help still available
oh yes abin
i got mje 15030 & 31 ( CE & CB Voltage was 120 - 150 )
can this replace mje 15032 & mje 15033 ( CE & CB Voltage 250 ) ?
i got mje 15030 & 31 ( CE & CB Voltage was 120 - 150 )
can this replace mje 15032 & mje 15033 ( CE & CB Voltage 250 ) ?
compare the de-rated SOAR of the proposed devices to that of the recommended devices and compare both to the stress they will undergo in the amplifier.
It may be that both can meet the heat & current/voltage requirement or that neither can be reliable in your implementation.
niehau abin,
im in china a lot. i am very interested in your pcb, but even more in your chassi... i have address in beijing, shanghai, guangzhou and hong kong ... your choice!
id love to get access to some of the pcb and also good chassi. i am in singapore but spend lots of time in china every month. let me know....
par
meaning
how are you abin ?
Parb want to buy your pcb, heatsink & chassis
he is singaporian but always go to china
for delivery please choose the near city from yours
either in beijing, shanghai, guangzhou or hongkong
he can receive your package there
you can give offer for Parb now
(and another free pcb for me 😀, just kidding man)
how are you abin ?
Parb want to buy your pcb, heatsink & chassis
he is singaporian but always go to china
for delivery please choose the near city from yours
either in beijing, shanghai, guangzhou or hongkong
he can receive your package there
you can give offer for Parb now
(and another free pcb for me 😀, just kidding man)
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Dont forget uncle Jacco Lecture
http://www.diyaudio.com/forums/solid-state/31077-krell-ksa-50-pcb-482.html
http://www.diyaudio.com/forums/solid-state/31077-krell-ksa-50-pcb-482.html
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