This Week I Learned - 2017 Week 37

The old stuff or last week post?

Slow week but things are moving ahead. More focus and getting more deep work done.


Familiar name that caught my attention while watching the game demo. Glad to see him living his dream and doing what he love. He is part of the team (Ninja Theory) that developed Hellblade: Senua's Sacrifice (watch the development diariesIGN's review, or GamePlayHK's broadcast) is worth checking out. I've wondered, what if I'm more persistent and follow his path?





The Search for Better Search at Reddit. Every initial search implementation starts with default Database's own internal natural language full-text search implementation. For PostgreSQL is Tsearch2 and MySQL is FULLTEXT index.


Different publications have different writing style guides. If you're going to publish to their journals, follow their convention.


When comes to affordable (ahem, cheap) amplifier, Lepai is a well-known brand and the general most people would recommended it as your first amplifier. However, there was confusion about another brand, Lepy or Lvpin, which was initially thought as a clone but actually is the same company but a new name. To differentiate this, Lepai brand is used in US or internationally by Part Express and Lepy brand is used in China or TaoBao. Different name confused and influenced my search effort as I was searching for the wrong brand name. Nevertheless, if you searching for Lepai amplifier in MY, search for "Lepy" keyboard instead.

Even though these are cheap amplifier, the audio amplifier chip (more on this later) and quality of the capacitors will determine the overall sound output and pricing. Some audio enthusiasts with good electronic knowledge will purchase this category of amplifier and upgrade or modify it with better parts.




Tripath TA2020 is interesting audio amplifier chip. IEEE ranked it as one of the microchip that shock the world as it allows consumer grade sound systems to produce higher sound at a lower price. It even created a new amplifier category, Class-T amplifier, which is a proprietary variant of Class-D amplifier.

Entry level amplifier typically based their design on these few variants of Class-D/Class-T amp chips.

(1) Tripath TA2020A/TA2020A+ (20 watt per channel), TA2021, TA2024(15 watt per channel).
(2) Texas Instruments TPA3118 (30 watt per channel).
(3) STMicroelectronics TDA7492PE (45 watt per channel).

Discussion on different audio amplifier brings no benefit if you're not a audiophile or trained ears to notice the subtle differences. For a beginner, start with the cheapest possible amplifier available at your place.





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