Amplifier Modules and PCBs For Sale

[Deleted member 148505]

JLE-1500D 4R THD and IMD measurements

Output mosfets: IRFB4227
IRS2092 deadtime setting: DT4
Gain: 36

 

[Deleted member 148505]

JLA-250D 4 ohms load THD and IMD

Currently selling on ebay.
Output mosfets: IPP320N20N3
IRS2092 Deadtime setting: DT3
Gain: 36
Power Supply: Abletec +/-53V DC

 

[AlexScan]

Actually i see the JLA-1500 has better measurement, but at listening what it gives the best sound ?

 

[Deleted member 148505]

Actually i see the JLA-1500 has better measurement, but at listening what it gives the best sound ?

Haven't tried to listen to it on stereo, I will have a listening session after I tried to put the housekeeping supply. Also JLE-1500D's measurements might also improve. Also inductor used has large impact on THD measurements, specially when I use Micrometals T130-2, around 3x higher.

 

[Deleted member 148505]

This one has a high THD, but has a very good sound!.

 

[Deleted member 148505]

New PCBs on my ebay page.
pls click on my signature

 

[Deleted member 148505]

Bridged JLA-250D on 8 ohms load (10 seconds only, to check for headroom)

Unloaded rail voltage +/- 86V DC
Rail voltage on 1.1KW output = +/- 70.2V DC

If power supply like SMPS is regulated (very stiff and does not drop on high power load), the modules can attain the same power with only +/-70VDC rail supply.

 

[Greg32]

94vrms @8ohms very impressive.

 

[Deleted member 148505]

94vrms @8ohms very impressive.

Thank you, I used JLA-250D V2 for the tests, the one with black PCB, and T130-2 inductors so THD is higher than the ones using Coilcraft VER2923.

Rail voltage is +/- 86V DC. Uses IRFB5620, deadtime on IRS2092 set to DT3.

Attached are the THD measurements of bridged JLA-250D V2. The "grass" and 60hz mains harmonics are due to my "poor" linear supply, it only uses 2pcs 6800uF and paralleled KBPC3510. I'll acquire an SMPS next time so I can make better THD measurements.

Unfortunately, a visitor dropped by so I wasn't able to continue past 500W, i'll publish 800W and 1000W next weekend.

 

[Deleted member 148505]

More products!

JLE-250S
- Successor to JLA-250D, all 1206 or 1210 SMD parts so it can be easily hand soldered.
- Built-in Housekeeping supplies
- Built-in Speaker Protect
- Prefilter feedback conventional design
- Will be sold as an assembled module only.

Soundcard Interface for PC Audio Analyzer
- Powered by USB or 5V single supply, has a cheap isolated DC-DC converter
- Has a differential input, can be used for measuring THD of bridged mode amplifiers.
- Uses THAT 1200p08-u and a dual opamp
- Soundcard is always protected from large DC or AC signals
- Up to 100Vrms input, output going to soundcard is adjustable from 0Vrms to 1Vrms

Balanced Line Driver
- Powered by USB or 5V single supply, has a cheap isolated DC-DC converter
- Complementary for Soundcard interface
- Uses THAT 1646P08-U and a single opamp
- Up to 10Vrms output

Balanced Line Receiver
- Powered by 12-0-12V AC supply (or 15-0-15V DC)
- Uses THAT 1200p08-u and a dual opamp, dual PCB configuration so that INA134 and the likes can be used.
- Dual output buffer can be used for bridging amplifiers, it has unity gain inverting and non inverting output.
- If used as a preamp for a single channel amplifier, the inverting opamp can be set to higher gain.

 

[Deleted member 148505]

Repeated measurements of post #309
Version 2 of JLA-250D (rated 500W at 4 ohms only)
Changed power supply capacitors to 10000uF per rail

 

[Deleted member 148505]

JLE-800D on +/-85V DC Rails FFT Spectrum 8R Load

Output Inductor: Coilcraft VER2923-223KL
Output Mosfets: IPP320N20N3
Gain: 36

Low THD on low power levels, mostly K2 dominant. Didn't continue past 2R 500W, THD is over 1%, looks like inductor is saturating, high power low impedance load will measure better on 1D31A output inductor. (It is compatible)

 

[Deleted member 148505]

JLE-800D 4ohms and 2 ohms load FFT spectrum cont.

 

[Deleted member 148505]

Populating boards for QA400 interface and balanced line driver.

Balanced line driver uses THAT 1646 Outsmart IC and a single opamp buffer (like LME49710)

Interface for soundcard - THD Audio Analyzer, protects the soundcard from DC and large output signals from amplifier. Up to 90Vrms input. Uses THAT 1200p08-u, and dual opamp (like LME49720)

Both uses 5V 500mA to +/-15V isolated DC-DC converter. Can be powered from 500mA USB port or powerbank.

External +/-15V can be used instead of isolated DC-DC converter, all pins are spaced 2.54mm so terminal blocks can be used. Same with BNC connectors.

 

[Deleted member 148505]

Soundcard interface now available on my eBay page.
Default attenuation of -6dB, also noise floor penalty is 3dB, so you will lose some -9dB from original noise floor loopback measurement of soundcard.

Loopback of QA400 at -6dBV input.

Loopback of QA400 with the interface connected on the front end. Single ended input.
Output of QA400 is 1dBV = 1.12Vrms, attenuated by interface by -6dBV resulting to 544mVrms output going back to QA400.

Sample measurements on TPA3106 at 10W 8 ohms load.
Both balanced and SE input mode. Ouput is BTL. 19.5VDC rails

2pcs Blank PCB: Mono Interface for soundcard based FFT spectrum analyzer | eBay

Suggested parts are INA134 and NE5532.

 

[Deleted member 148505]

Added balanced line driver on my eBay page.

USB Powered, uses an isolated DC-DC converter.

For THAT 1646P08-U

2pcs Blank PCB: USB Powered - Balanced Line Driver for THAT 1646P08-U | eBay

 

[Deleted member 148505]

Latest PCB for high power class-d amplifier.

JLE-800S, available on my eBay store.
2pcs Blank PCB: Mono JLE-800S 800W Class-D Amplifier AUIRS2092S IRS2092S | eBay

Compatible inductors

• Micrometals T130-6
• Ice Components 1D31A
• Ice Components 1D23A
• Coilcraft VER2923
• Coilcraft AGP2923

 

[AlexScan]

Good job Lester !

Actually the JLA-800D as better THD measurement on 8R 10W than the JLA-800S, but concerning the sound tell us waht is you preferred and what is the difference ?

 

[Deleted member 148505]

Good job Lester !

Actually the JLA-800D as better THD measurement on 8R 10W than the JLA-800S, but concerning the sound tell us waht is you preferred and what is the difference ?

The JLE-800S module that I used for testing uses T130-2 inductor, hence the higher THD numbers. I will make measurements with a module that uses Coilcraft VER2923-223KL.

I prefer the sound of JLE-800S with T130-2 inductor but maybe I'm just bias with my new design.

Regards,
Lester

 

[AlexScan]

The JLE-800S module that I used for testing uses T130-2 inductor, hence the higher THD numbers. I will make measurements with a module that uses Coilcraft VER2923-223KL.

I prefer the sound of JLE-800S with T130-2 inductor but maybe I'm just bias with my new design.

Regards,
Lester

Ok, you have tested JLA-800S with Coilcraft ?

The Mosfet is already the Infineon ?