New version of the ALS-HPULN Power Supply: With high quality foil caps (chosen for lowest leakage current, two in parallel for better ESR) to improve reference voltage, regulation precision and avoid any piezo effect!
 
Although the ALS-HPULN PS is the "High Current" version of the HPULN (High Performance Ultra Low Noise) Power Supply delivering up to 5 ampere for power-hungry devices, the real benefit is the dramatically reduced noise through 10x LT3045 in parallel operation.
This current might not be necessary in your application, nonetheless this fact is worth this power supply to become our recommendation for AC-powered setups.
 
The scope of application is a main power supply for any kind of devices with a need of up to 5 ampere, i.e.:
- Audio interfaces
- DAC's
- Small amplifiers
- Audio-Computers
 
With a bigger heatsink compared to other HPULN modules, the ALS-HPULN is also capable to better dissipate heat from the regulators. In AC-powered setups the transformers secondary voltage should be chosen to generate a low voltage difference between input and output to keep heat low, in passive cooled setups with a good heat dissipation the module is able to dissipate max. 4W (less is better and recommended). Our measurements will be helpful here: Which transformer voltage should I choose?
MPAudio offers highest quality custom made transformers with individual secondary voltage for that purpose.
 
ALS-HPULN special feature: Anti-transformer-ringing snubber
The ALS-HPULN has a snubber option, which makes it possible to significantly reduce transformer ringing. The snubber consists of two capacitors and one resistor, that in combination match the transformer's characteristics.
Please see "Quasimodo PCB" for more information. In case of ordering this power supply with a transformer, the snubber will already be configured by MPAudio. In case it's ordered alone, the snubber can be set by the customer - we recommend to use the Quasimodo jig for that purpose, which makes it possible to realize a snubber without the effort of measurements and deep mathematical knowledge.
The ALS-HPULN power supply can also be used without a snubber. In this case the snubber is not assembled and can be activated for final setup by the customer.
 
As usual this power supply comes fully assembled and tested for 24h to ensure seamless working. A helpful HowTo will be provided after a purchase.
For more information regarding heat and transformator recommandation please note the instructions in our FAQ.