8 Channel LPT Relay Board

Specifications:
Channel Relay Board is a simple and convenient way to interface 8 relays for switching application in your project.

• Input - 12 VDC @ 336 mA
• Output - eight SPDT relay
• Relay specification - 5 A @ 230 VAC
• Trigger level - 2 ~ 5 VDC
• Berg pins for connecting power and trigger voltage
• LED on each channel indicates relay status
• Power Battery Terminal (PBT) for easy relay output and aux power connection
• Four mounting holes of 3.2 mm each
• PCB dimensions 169 mm x 72 mm

Schematic:

Parts List:

PCB:

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8 Watt Flouroscent Lamp Driver Circuit

This is a design circuit of a simple flouroscent lamp driver circuit based on two transistors. The circuit uses capacitive ballasting for driving the tube. An 8 Watt standard flouroscent tube can be efficiently driven using the circuit.

The two transistors (2SC1983) with associated components form an oscillator around 1KHz. The oscillator is wired so that saturation conditions of the transistors are prohibited. This adds on to the efficiency of the circuit. The circuit produces a clean sine wave with very less noise. The winding details (no of turns) are given in the circuit. Use 0, 8 mm diameter enameled copper wire for primary and 0, 4 mm diameter enameled copper wire for secondary. The core can be a ferrite core. The primary should be wound first and secondary on top of it. The circuit is use a 12 V battery or 12 V DC power supply as the DC voltage source.

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