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Monkeyboi last won the day on May 17 2014

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About Monkeyboi

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    D.I.Y. Audio Enthusiast

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  1. If you were pulling more than 3A, then the original diodes would be inadequate IMHO and IME most likely to fail prematurely. Nothing wrong with using large value capacitors with a lower ESR. Firstly they will have a lower loss and dissipation and the Nichicons are a good choice, and secondly they will most likely last longer than the "no name" types. The point of the whole exercise is does the unit effectively block any d.c. content present on the mains? IME, most Chinese designed devices have overly inflated specifications and at best achieve about 50% of what
  2. I'm not doubting you mate. Just the circuit makes no sense whatsoever. Cheers, Alan R.
  3. I think there's an error in the reverse engineering. The two 2200uF capacitors appear to be effectively across the mains and not in parallel with the diode arrays in a series configuration with the output, that is in series with the load . Also they are in aiding (+-+-) not opposing (+--+) polarities. Cheers, Alan R.
  4. What people spend their money on is of no concern to me mate. I just have a low level of sympathy for them when they get scammed with an amplifier that delivers half the output power the maker claims it's supposed to or is equipped with a transformer that's well below the required VA rating and with a 220v primary instead of a 240v primary which experiences a meltdown or blows up. 🤣 Likewise for other bits of kit with outrageous claims We live in a disposable society Andy. People aren't interested in real quality. What they want is lots of "gold" plated plastic bling. Things a
  5. #1 rule of diodes. Same way connected parallel diodes don't share the current equally. The one with the slightly lower forward voltage drop will start conducting more than the other and eventually sink most if not all of the current. If the maximum sustained current through the conducting diode is exceeds its rating it will fail. This same rule applies to zener diodes for the same reason except in a zener we are referencing the reverse avalanche breakdown voltage (the zener voltage in layman's terms). Now when the first diode fails due to excessive current it will most probably
  6. This unit is more like the business. Beefy diodes with a 10A continuous current rating. Personally I would have mounted them with a bit of clearance above the PCB as they will get hot with a full 10A load. The electrolytics are rated at 15.1A @ 60 deg C. Aluminum electrolytic capacitors - Snap-in capacitors - B41231 (tdk.com) Cheers, Alan R.
  7. Sure it can pass 10A if it is designed correctly and it will do this with minimal volt drop within the device. A d.c. blocker with piddly 2200uF caps won't pass 10A safely. Most 2200uF / 50V electrolytics aren't rated to pass 10A, more like under 2A even for low ESR electroytics. Just check the ripple current ratings of a typical 2200uF / 50V. Most are rated at about 1.7A maximum. Sustained currents exceeding the ripple current rating of the capacitors will eventually result in their failure due to inrush currents at switch on. Whilst the inrush current will be brief it will eventua
  8. Good to read that you resolved the problem. 👍 IMHO, there's nothing more annoying than a buzzing transformer. It really detracts from the lower level listening enjoyment IME. 😟 It's a possibility that you have more than 1.2 - 1.4 volts of d.c. on your mains supply in which case a d.c. blocker with just 4 diodes in it won't fully eliminate the d.c. If you have a digital multimeter that is capable simultaneous a.c. and d.c. voltage measurements you can quickly determine the magnitude of the d.c. voltage present on your mains supply. If your step-down transformer is on
  9. Absolutely. The Australian made units have to pass electrical certification and safety test before they can be legally sold here in Australia. Exactly the reason why some bits of hifi kit aren't retailed here. It's either because it doesn't meet Australian Electrical Safety Standards or the manufacturer / distributor doesn't want to pay for the certification testing. When you personally import a bit of electrical equipment (in this case a d.c. blocker on a PCB or in kit form) it's probably going to slip through Customs without much problem. However, connecting it directly to t
  10. BTW, as a matter of interest, what are the capacitance and voltage ratings on those two electrolytics? Cheers, Alan R
  11. Hmmmm...... Just looking at those two pissie little electrolytic capacitors at the mains input side. 2000W capacity at 240v = 8.33A. Unless they have very large capacitances with a very high ripple current rating I seriously doubt if they could sustain that current flow without one hell of a voltage drop or for very long before the magic smoke escapes with a loud bang. There's only one way to find out. Hook it up to a 2kW bar heater and stand back. Oh, and BTW wire a fuse or circuit breaker in the mains input side just for safety and piece of mind. I sure as hell would be
  12. I saw that too. Same pictures. Same serial number. Maybe the sale fell through? 🤔 Cheers, Alan R.
  13. What type of output connector does it need to have? USB Type A, USB-C, round barrel jack? Does it need a single output or multiple outputs? Something like the above pictures but with USB or d.c. barrel jack connector(s) instead of the one shown? Cheers, Alan R.
  14. Yes, you will get slugged 10% GST on both the item and the shipping cost. Cheers, Alan R.
  15. Not off topic IMHO. In fact quite related. The often overlooked solution to the problem. I sometimes find it amusing and saddening all at the same time that someone would spend thousands of dollars on a pair of interconnects only to realise that the only person who benefited from the "upgrade" was the retailer who sold them. Now please don't misinterpret my words. I'm not anti-cable or a person who doesn't believe in worthwhile improvements, but I'm with @rockeater on this one. Take care of the room acoustics and try different loudspeaker positioning first before pointing the
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