Here the low resistance connection tester which can be used as cable or wire tester, soldered joints and other types of connection with resistance value between 0.25 and 4 ohm….
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Wailing Alarm Siren
Here is the wailing alarm siren circuit diagram: Components List: R1,R5___________ 4.7K R2______________ 47K R3______________ 10K R4______________ 100K Rx______________ *see text C1,C4__________ 100uF/25V, electrolytic C2,C3__________ 0.01uF (10nF), ceramic T1_____________ 2N3702…
Insect Repellent
…Looked Loop) oscillator circuit using a CMOS 4047 with a frequency of 22 KHz. Current drain is around 120mA. So, external power supply is recommended for better results. Source: http://www.zen22142.zen.co.uk/Circuits/Misc/insecrep.html…
Simplest RF Transmitter
…may make experiment with all of the components value in this circuit. Nothing is critical in this circuit, but the performance can be varied considerably. Simplest RF Transmitter Source: http://www.sentex.net/~mec1995/circ/rft1.htm…
FM Voice Transmitter
…RF bypass capacitor that might assist enhance performance and improve the range a bit. Experiment to find greatest results. L1 was produced by stripping 22 gauge hookup wire of it’s…
Easy Build Motorcycle Alarm
…relay and siren voltages to suit, it might be fitted inside a personal computer or anything else that is in danger of becoming picked up and carried away. The low…
Easy Build FM Transmitter
…normal broadcast frequencies (88-108MHz). You may want to bypass the battery with a .01uF capacitor. An antenna may not be required for operation. Easy build FM transmitter circuit source: http://www.aaroncake.net/circuits/fmtrans.asp…
Digital DC Voltmeter based ICL7107 Chip
…IC LM7805 to achieve 5V stabilized voltage. This circuit will be good to display your power supply output. Components List: R1 = 8K2 R2 = 47K / 470K R3 =…
Safer Security System Alarm
…happens to contain the right combination of comparators and logic circuits to do what you need. Step 1 is to translate the loop resistance into a voltage; that”s done by…
2 Watt Mini Audio Amplifier
…in order to obtain good harmonic distortion behaviour and to avoid hard to find components. The amplifier(s) can be conveniently supplied by a 12V wall plug-in transformer. Closing SW1 a…