This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one-and-a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying and unauthorised video transmission. [...]
This is circuit 300W Inverter power,so input battery 24V to Output 220Vac 50Hz 300W. I used main Component IC CD4027 , NE555,CA3130 and LM7805. The transistor power MJ15003 driver transformer 24V 10A min. The VR1 – 100K is control Frequency output at 50Hz 50Hz or 60Hz at Square wave signal. The VR2 – 50K is [...]
Normally, in a digital voltmeter, high input impedance of the preamplifier stage is protected against very high voltages by two diodes. One of them is connected to the positive terminal and the other one is connected to the negative terminal of the power supply. Practically this kind of protection is very sufficient. But the diodes [...]
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