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  • Posistive one-shot

    Posistive one-shot by 4528<cut> IC 4528 CMOS is dual monostable Multivibrator that can trig both rise ad fall edge. T1 and T2 use determine input timming,RST is reset and +/-IN is input tringger. </cut> VN:F [1.6.9_936]please wait…Rating: 0.0/10 (0 votes cast)VN:F [1.6.9_936]Rating: 0 (from 0 votes)

  • Transmitter FM 45W with valve

    TECHNICAL CHARACTERISTICS: Tendency of catering: 220V AC Frequency of emission at FM: 88~108MHz Force of expense: max 45W (without the R3), R1 15KW/2W R2 1KW/10W R3 1KW/10W (for biggest force in the exit you replace with short-circuit). C1 50pF trimmer C2 30pF trimmer C3 22pF/4KV C4, c6, c9 10nF/1KV C5, c7 1nF/1KV C8 100mF+100mF/450V (Double […]

  • Phone Broadcaster

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  • FM Telephone Bug

    Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to build and is therefore a good, useful […]

  • Wireless Telephone Bug

    Here’s a neat little project that will allow you to monitor your phone line as soon as your phone is off hook. You can use a regular FM broadcast band radio to monitor the conversation. Just remember, it may not be legal to do this. You should check with local law authorities to determine the […]

  • Coilless FM transmitter !

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  • Long range FM transmitter

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  • Powerful AM transmitter

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  • AM Transmitter

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  • 15W Fm-transmitter

    It was five years ago when I did an attempt to build my first fm-transmitter. It ended in a giant faillure. The only thing it did was interferring with our tv-set. Looking back it was due to the lack of information I had. A schematic was my only help. Now, five years later, I know […]