Liquid level alarm for 4 tank

Today I made this Liquid Low level Alarm project. already I make one before to monitor a single Tank. But This will Monitor 4 liquid or water Tank. when any Tank reach Low liquid Level a sensor give signal to this device .so The warning Lamp related to that tank start blinking and an beeping Alarm sound also start. we can silence the beeper by pressing the push switch. and the indicator stay on until the liquid level normal.

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Boot Menu Option Keys

Below is a list of PC brands with their corresponding hotkeys for the boot menu and BIOS option. Computer Manufacturer Type Model Boot Menu Key BIOS Key ACER SERIES ACER Esc, F12, F9 Del, F2 ACER netbook AspireOne, Aspire Timeline F12 F2 ACER netbook Aspire v3, v5, v7 F12 F2 ASUS SERIES ASUS desktop F8 F9 ASUS laptop ...

Transistor numbers and codes

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Ring tester

In my Electronic repair job I found normal multimeter is somewhat limited in certain area. so special tools are needed for saving a lot of time Ring tester is one of this kind .helping me to check small hi Q inductors SMPS transformer, TV Deflection coils ,LOT ,line driver transformer and almost any inductor working on hi frequency.Normal multimeter can only identify a open coil ,but not a shorted windings. I found some commercial available ring tester. but it is not available in local shops of my area.also it seems priced high. So I decided to make a ring tester of my own. Below is the one I successfully made from the junk box components. I found it very useful. and now it is one of my best test tool collection. Two Ic's, few LED's ,one plastic container and few resistors made this wonderful tool. If we test it with primary of SMPS transformer or LOT windings of a good one shows all its LEDs will light. depending on the inductive reactantce...

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