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Amplifier Modules and PCBs For Sale

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Deleted member 148505

Stock IRAUDAMP7 with minor modifications.

- irfb4227
- reverse switching diode for fast gate turn off
- bleeder resistor on mosfet G-S
- 10 ohms gate resistors
- 10 ohms R114
- 100ns deadtime setting
- added speaker protect circuit.

No totem poles and other modifications, can get 1kw into 2 ohms, it's all in the layout :)
 

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Stock IRAUDAMP7 with minor modifications.

- irfb4227
- reverse switching diode for fast gate turn off
- bleeder resistor on mosfet G-S
- 10 ohms gate resistors
- 10 ohms R114
- 100ns deadtime setting
- added speaker protect circuit.

No totem poles and other modifications, can get 1kw into 2 ohms, it's all in the layout :)
This is very interesting, have you finalized the modifications? this fits all my requirements for load flexability, power and physical size. is this avaliable as a prebuilt or just pcb . Greg
 
D

Deleted member 148505

No, IC is heating up. Just decided to use IRFB4615/5620. 45ns DT, 400 kHz. Sound is better than most iraudamp7 implementations out there. Sounds like high powered LM1875

Will release version with zetex 3003 buffers. IRFB4227, 75ns DT, 400khz fsw.
Compatible inductors 7G31A, T130-2, ver2923-223, .
 

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D

Deleted member 148505

Stock IRAUDAMP7 with minor modifications.

- irfb4227
- reverse switching diode for fast gate turn off
- bleeder resistor on mosfet G-S
- 10 ohms gate resistors
- 10 ohms R114
- 100ns deadtime setting
- added speaker protect circuit.

No totem poles and other modifications, can get 1kw into 2 ohms, it's all in the layout :)

Final modifications for IRFB4227 build. (Also applicable to other IRAUDAMP7 builds without buffer)
  • Heatsink for IRS2092
  • 4.7R 1/2W gate resistors with reverse schottky
  • 100 ohms 1W R114
  • 12V zener Z1, Z102
  • 320 kHz fsw
  • omit R26 for DT 105ns
  • 33 uH output inductor.

Main concern is the heat output of IRS2092. IRFB4227 and inductor is cool in this config.
 
Final modifications for IRFB4227 build. (Also applicable to other IRAUDAMP7 builds without buffer)
  • Heatsink for IRS2092
  • 4.7R 1/2W gate resistors with reverse schottky
  • 100 ohms 1W R114
  • 12V zener Z1, Z102
  • 320 kHz fsw
  • omit R26 for DT 105ns
  • 33 uH output inductor.

Main concern is the heat output of IRS2092. IRFB4227 and inductor is cool in this config.

What is min and max voltage for this amp?
Cost of a completed board / kit ?
Would you ship to europe?
 
D

Deleted member 148505

What is min and max voltage for this amp?
Cost of a completed board / kit ?
Would you ship to europe?

Max voltage is 85V for the 4227 build if you're using linear supply with 2x10000uf caps. (or better)

Min voltage depends on VSS/VAA/VCC regulator settings. Set it such that the amp will not hiccup even if rails drop to 20vdc lower than the nominal.

Not yet selling JLA-250D with IRFB4227. ETA is on March.
Current available is JLA-1200D (iraudamp9), it has all the power you need. Easily drives 2 ohms load.
 
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Suitable for Bass Guitar Amplifier?

What would you recommend for a Bass guitar rig?

I already have a 1500 watt power supply and a single 12 volt floating power supply. Do I need a second separate 12 volt for powering two channels?

Supply already has soft-start. Voltage is about 58 volts-0-58 volts. I'm not opposed to winding a second 12 volt secondary - it's a toroidal transformer, so no big deal. The current 12 volt supply board has the soft-start circuit for the initial power supply turn-on built into it, and it also has a fast fall time loss-of-power output sense. Voltage is about 58 volts-0-58 volts.

I need two channels - each will need to drive both 4 and 8 ohm cabinet loads.

Have there been any tests without loads attached or with a momentary shorts to the speaker line? Does overcurrent protection shut down the amp in such events?

I take it there is no DC-on-the-speaker output shutdown, Correct? Would this be hard to implement?

Really like the design and I have a nice large heat sink to attach the output mosfets to already built into the case.

Bart
 
D

Deleted member 148505

What would you recommend for a Bass guitar rig?

I already have a 1500 watt power supply and a single 12 volt floating power supply. Do I need a second separate 12 volt for powering two channels?

Supply already has soft-start. Voltage is about 58 volts-0-58 volts. I'm not opposed to winding a second 12 volt secondary - it's a toroidal transformer, so no big deal. The current 12 volt supply board has the soft-start circuit for the initial power supply turn-on built into it, and it also has a fast fall time loss-of-power output sense. Voltage is about 58 volts-0-58 volts.

I need two channels - each will need to drive both 4 and 8 ohm cabinet loads.

Have there been any tests without loads attached or with a momentary shorts to the speaker line? Does overcurrent protection shut down the amp in such events?

I take it there is no DC-on-the-speaker output shutdown, Correct? Would this be hard to implement?

Really like the design and I have a nice large heat sink to attach the output mosfets to already built into the case.

Bart

JLA-250D V1 and JLA-1200D highest unloaded rail allowable is +/-85VDC
58-0-58VAC secondary is quite high if you consider +10% increase in mains voltage. So not suitable. 56-0-56VAC is ok.

For speaker protect or JLA-250D speaker protect supply, you need 12VAC or 15VDC fast turn off, referenced to ground.

For JLA-1200D VCC supply, you need 12VAC or 15VDC referenced to -V.

Momentary short is no problem, OCP kicks in.

Running the amp without load is ok if you are only using 1 channel. But if you are powering 2 channels and only 1 is running and connected to load, the other amp without load is oscillating. So both channels should be connected to load.

JLA-250D V2 and JLA-1200D both have external mute header referenced to VSS. You can use it to shutdown the amp for no-load sensing, overheat protect, speaker dc detect etc. but you have to implement it yourself.
 
Couple nits to clear up - ac transformer is 43-0-43 VAC. 58-0-58 is unloaded DCV.

When you say
Running the amp without load is ok if you are only using 1 channel. But if you are powering 2 channels and only 1 is running and connected to load, the other amp without load is oscillating. So both channels should be connected to load.

Not sure I understand what you mean. Is the issue power supply conducted EMI, and is the other amp oscillating a problem if it's not connected, or... please elaborate.

And I missed one answer
Do I need a second separate 12 volt for powering two channels?

Was that a yes or no?

Thanks!!
Bart
 
D

Deleted member 148505

Couple nits to clear up - ac transformer is 43-0-43 VAC. 58-0-58 is unloaded DCV.

When you say


Not sure I understand what you mean. Is the issue power supply conducted EMI, and is the other amp oscillating a problem if it's not connected, or... please elaborate.

And I missed one answer


Was that a yes or no?

Thanks!!
Bart
JLA-250D V2 fits your requirement, it can drive 2 ohms load easily.
You can use 12v for both modules, please check first page for connection diagram.

In a stereo setup the amp without load will become unstable. You can put 100ohm > 10W resistor if you will not use the other amp in a stereo setup.
 
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Hi just a question about the jl250v2, the aux 12v for the speaker protection does it have to be ac could it be dc? and is it referenced to any of the main power supply rails? I ask as i wish to use this board on a smps i have built which runs from 12dc and generates +-60v rails, i could put an extra winding on my transformer for 12v but it would be ac at 65khz.
thanks Greg
ps how are the jl250 boards with the zetec buffers going?
 
D

Deleted member 148505

Hi just a question about the jl250v2, the aux 12v for the speaker protection does it have to be ac could it be dc? and is it referenced to any of the main power supply rails? I ask as i wish to use this board on a smps i have built which runs from 12dc and generates +-60v rails, i could put an extra winding on my transformer for 12v but it would be ac at 65khz.
thanks Greg
ps how are the jl250 boards with the zetec buffers going?

You can use DC but it should be 15V, referenced to ground. Also the DC should turn off fast, should not have large capacitance so that the relay will turn off fast at power off/dc protect mode. Use fast rectifier, built in rectifier cannot handle 65khz AC.

JLA-250D (will be named JLA-1000D) with zetex buffer PCBs are still being manufactured as of now. Will be sold as preassembled and tested (will not sell PCB), Inductor and IRS2092 DIP IC are not included to keep the price down and also reduces the weight for shipping. (shipping out here is expensive!)
 
D

Deleted member 148505

Slow progress for JLA-1000D, used zetex zxgd3003 for buffer. VAA/VSS/VCC can be supplied externally for those who are using SMPS, though only optional as iraudamp7 original housekeeping supplies are still present on the PCB.
 

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D

Deleted member 148505

JLA-1000D
2 ohms stable, up to +/-85V DC Rails.
IRFB4227, 3003 Zetex buffer,
Can be used with T130-2, 7G31A, VER2923-223
 

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