Sunday, November 17, 2013

Simple Water operated relay

This was done in my early days, i have upgraded it, it ought to work, reduce the number of transistors to make it less sensitive, also a lower value in place of 10M will reduce its sensitivity, use clamping diodes to protect.

BD139 is used to drive the relay as it has good Ic. So you can even use a low ohm relay. If a Relay resistance is high its quality is higher, its power consumption is less and it needs thinner wire SWG-AWG. T2 and T3 form a darlington pair which drives T1. LED1 shows that the water level has reached the top of tank and also that the Relay is energised. D1 a freewheeling diode. R3 10M ensures that the high gain input does not float, yet the low leakage current thru the water is not drawn away by the 10M. R2 limits base current in case water is saline.
Simple Water operated relay

See more at Circuits with Discrete devices

Wednesday, November 13, 2013

Raspberry Pi BitScope

A fully integrated Test bench based on Virtual Instruments - mixed signal oscilloscope, logic analyzer, spectrum analyzer and waveform generator using BitScope connected via USB or Ethernet to the now very popular Raspberry Pi.

Raspberry Pi BitScope

Regardless of which BitScope you choose, the new BitScope Library is also available making it easy to create your own embedded test, measurement or data acquisition applications using BitScope and Raspberry Pi. Program in C/C++, Python or Pascal using an easy to use programming API.

 Raspberry Pi BitScope

BitScope Model 10 - World's Smallest Mixed Signal PC Based USB Oscilloscope!

BitScope Pocket Analyzer. It's a problem solver that fits in the palm of your hand. Perfect for designing, prototyping and debugging!

It has 100 MHz bandwidth, up to 40 MSps logic, simultaneous waveform and clock generation and offers serial control of connected devices.  It's the ideal tool for prototyping analog electronics projects, digital and logic circuits or Arduino, Raspberry Pi and other microcontroller based systems with busses, sensors, servos and I/O.
Hobby Projects - Insulation tester, LED Circuits, Meters.

Practical Electronics

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Basic Electronics, EE Reference Resource, Analog, Digital, Power and Electrical.

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