This circuit designed by Mr Piotr Szyszka (I amp DIY Poland) and I have build this under his permission for my amplifier projects thought to share some since I got some extra pcs. This is available with Australia/European/UK output plug please note when u order. Thanks a lot Mr Piotr Szyzka. Filter the mains power line noise. Slow start function so no inrush current dammage.
DC components on the AC line cause damage in to power transformers in long run this will block the DC off set on main line. Can control ON/OFF function with smaller switch 30mA. Description from the original designer. Simple Soft-Start + DC Blocker + Mains filter. Simple soft-start for the transformer works in very simple way.Two relay coils are driven by the CX3 capacitor reactance, sufficient time delay is provided by C6 capacitor. It is very important to use 24V DC coil relays with resistance 1,44kR.
Two LED's are informing when each relay is active. The amplifier can be switched ON/OFF with only 20mA so there is no need to use huge''hefty'' power switch anymore. During the start-up the mains current is limited with two 47R/5W resistors connected in parallel, the max current for 230VAC mains is approx 10A. After a few seconds Relay2''kicks in'' and the current limiting resistors are clamped.
On the board there is build in mains filter and DC-Blocker, both of the components should be placed in any amplifier anyway so I decided to''melt'' them on a single board. Schematic and gerber files are on the bottom of the page.
PLEASE BE CAUTIOUS WHEN WORKING ON MAINS VOLTAGE!! PLS NOTE 110V/120V when u order need to modify.The item "DC BLOCKER MAINS FILTER SOFT STARTER MADE IN AUSTRALIA. 240V/110V/120V" is in sale since Thursday, April 19, 2018. This item is in the category "Electronics\Home Audio Stereos, Components\Amplifier Parts & Components". The seller is "rfwaves2" and is located in Hamersley. This item can be shipped worldwide.