Bora is a nice guy from Serbia - Yugoslávia

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#681
omni protector

Dear Sir
greetings please can you show
1 where is acessory input to be connected
2 since transformer is 50 0 50 there is no 7 volt ac tapping how to use the 2 resistors to get 7 volts ac and please their VALUES
hoping you can please help me
warm regards
andrew lebon
 
#684
omni protector

hi Nmos
greetings omni protector will be used with my h class amp main goal is to
1 cut off speakers if speaker impedance is below 2 ohms most h class amps can do it provided output transistors are rugged amp has been tested on 2 ohms
2 short circuit protection very important
3 clipping circuit will be there havent tested it clipping very important for amp
warm regards
andrew lebon
 
#685
andrewlebon said:
hi Nmos
greetings omni protector will be used with my h class amp main goal is to
1 cut off speakers if speaker impedance is below 2 ohms most h class amps can do it provided output transistors are rugged amp has been tested on 2 ohms
2 short circuit protection very important
3 clipping circuit will be there havent tested it clipping very important for amp
warm regards
andrew lebon
Click to expand...


Hi andrewlebon

im confused......

what is omni protector ?

class h with quasi or Dr. Bora mosfet amp ?

or Do you mean Apex H900 class H amp ?

can you email me schematic padiscount@yahoo.com
 
#686
andrewlebon said:
Dear Sir
greetings please can you show
1 where is acessory input to be connected
2 since transformer is 50 0 50 there is no 7 volt ac tapping how to use the 2 resistors to get 7 volts ac and please their VALUES
hoping you can please help me
warm regards
andrew lebon
Click to expand...

Hi Andrewlebon

Maybe something like this...or put 50V AC instead od 7AV but increase resistor 1K with let's say 39K...
 

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#687
whats omni

im confused......

what is omni protector ?

class h with quasi or Dr. Bora mosfet amp ?

or Do you mean Apex H900 class H amp ?
hi Nmos
greetings OMNI is a DC protector for amplifiers it has
1 short circuit protection
2 turn on delay
3 cuts off speaker line if speaker impedance is below 2 ohms this can be set
can be used with most amplifiers
warm regards
andrew lebon
 
#689
omni protector

Dear Dr BORA
greetings please can you help me out want to find out how resistance to voltage regulator LM7824 is calculated and wattage of resistance
1 my supply voltage 72 volts dc positive negative
2 RELAY VOLTAGE 12 VOLT
3 relay coil resistance 160 ohms
warm regards
andrew lebon
 

Attachments

  • P1010040.jpg
    P1010040.jpg
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#690
Andrew, this is older version with 24V regulator for relays supply and it wasn’t reliable. Please make a small modification and replace that with simple one transistor stabilizer as on attached schematic. I know PCB isn’t designed for this, but modification is so simple it shouldn’t be a problem to do.
 

Attachments

  • reg 24V.GIF
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#692
boraomega said:
Andrew, this is older version with 24V regulator for relays supply and it wasn’t reliable. Please make a small modification and replace that with simple one transistor stabilizer as on attached schematic. I know PCB isn’t designed for this, but modification is so simple it shouldn’t be a problem to do.
Click to expand...

Hi boraomega

Im confused and have a problem....

how to connect Omni protection Point 7 and 9
in quasi complementary output stage

like Legend Stage master MK2 or Quasi NMOS

because Point 7 and 9 get full negative rail voltage trough 0,22 OHM resistor

any solutions ?
 

Attachments

#695
omni protector

, this is older version with 24V regulator for relays supply and it wasn’t reliable. Please make a small modification and replace that with simple one transistor stabilizer as on attached schematic. I know PCB isn’t designed for this, but modification is so simple it shouldn’t be a problem to do.

just remove ic 7824 the 2 10uf caps and the jumper to modify pcb for transistor stabilizer put TIP 41 WHERE 7824 was orignally
1 put 24 volt zener diode from base of tip41 to where jumper was taken out to ground
3 put 3.3k 1 watt from collector to base
no tracks to be cut PCB has all holes marked on it
warm regards
andrew lebon
 
#696
andrewlebon said:
, this is older version with 24V regulator for relays supply and it wasn’t reliable. Please make a small modification and replace that with simple one transistor stabilizer as on attached schematic. I know PCB isn’t designed for this, but modification is so simple it shouldn’t be a problem to do.

just remove ic 7824 the 2 10uf caps and the jumper to modify pcb for transistor stabilizer put TIP 41 WHERE 7824 was orignally
1 put 24 volt zener diode from base of tip41 to where jumper was taken out to ground
3 put 3.3k 1 watt from collector to base
no tracks to be cut PCB has all holes marked on it
warm regards
andrew lebon
Click to expand...

ok thanks for Info....will make new PCB, its easy for me but need a little time

if interested I can share it for supplier

I hope to get update for Omni to protect Quasi output stage
 
#697
Walkalone said:
Hi Dr. Bora and everybody! I'm new in forum.
I've read this topic, from page 1 to here. I'm interested in building the Sigma & Techno amps. They look seem similar topology, only difference is between BJT and MOSFET in OPS. My computer does not CAD program to draw the PCB. Someone please send to me the PCBs of both (top & bottom)?!
Click to expand...

Somebody can help me?
Top & bottom PCB layout of Techno & Sigma. (Send to my email: Nguyenthecuong1987@gmail dot com)
Very thanks for help me!!! 🙂
 
#699
Dear Dr.Bora
I'm completing the purpose of spare parts on the stage driver amplifier Sigma
2SA1407/2SC3601 or 2SA1406/2SC3600 the Sanyo brand. BJT brands like this are hard to find in my town. Is there a replacement series of other brands such as the brand Sanken, Toshiba or other brands. Thank you

Good Luck,
A.Pramudia
 
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