RLP Technologies

Hey! today I am going to show you how to make a lab bench power supply with very important properties.Such as current limiting. I searched in the internet for this but I couldn't find a single solution. So I thought to design a one for me and it worked nicely. So I thought of sharing my design on my blog OK. this is what we going to make. This will cost around 400$ on eBay . i cannot guarantee that u can build the exact thing. But this will make an equivalent This is what i built with my circuit diagram.   Doesn't it looks cool. Still the front panel is not printed for identification of controllers. there are 2 channels on the instrument. Left and Right both are equal and works separately. 1st 3 knobs are voltage, voltage fine tuning and current limiting.And the same for next 3 knobs. 1st 2 terminals are +v and -v for the 1st channel and the next two are for channel 2. bottom terminal is digital High (+5v) which is also and essential voltage output. So lets start...

5 to 7 volts will do

PT2308 is a Class AB stereo headphone driver chip utilizing CMOS Technology specially designed for portable digital audio applications. It is housed in an 8-pin DIP or SOP package and is functionally compatible with TDA1308. Pin assignments and application circuit are optimized for lower cost effectiveness and easy PCB Layout Vdd = 5V DC

IC - PT2305 Supply Voltage- 5V Operating current - 30mA all the ground pins must be connected to oV (-)

BE CAREFUL ! You are going to handle 230v  make the circuit and test  carefully! The LDR face needs to come off of the cover of the bulb, as the bulb works depending the background light condition.And also you must be clever to fix LDR on a place that will not fall LED light of its own 230 v -[Neutral , Phase ]