Modem Off Indicator
The modem off indicator is intended especially for serious Internet surfers. It will be seen that the circuit of the...
The narrowband FM radio transmitter frequency range 140-150 MHz
The radio transmitterwhich is schematically shown in figure 12 operates in the range of 140-150 MHz narrowband frequency modulation. Frequency...
Periodic Timer
Description:A switched timer with equal make and equal space periods timing adjustable from over 6 minutes to 38 minutes.Circuit diagram...
Miniature radio transmitter on tunnel diode
Among the large family of transmitters can select those devices that have a simple circuit design, the small number of...
Multi-band vertical antenna
Received among the Amateurs widespread vertical antenna type "Ground Plane" does not have sufficient broadband and no additional tuning can...

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