If your mobile transceiver works in your car but not in your home, what should you check first?

What device converts household current to 12 VDC?

Which of these usually needs a heavyduty power supply?

What may cause a buzzing or hum in the signal of an AC-powered transmitter?

A power supply is to supply DC at 12 volts at 5 amperes. The power transformer should be rated higher than:

The diode is an important part of a simple power supply. It converts AC to DC, since it:

To convert AC to pulsating DC, you could use a:

Power-line voltages have been made standard over the years and the voltages generally supplied to homes are approximately:

So-called "transformerless" power supplies are used in some applications (notably tube-type radios and TV receivers). When working on such equipment, one should be very careful because:

If household voltages are consistently high or low at your location, this can be corrected by the use of:

You have a very loud low- frequency hum appearing on your transmission. In what part of the transmitter would you first look for the trouble?