How to Design Schematic Circuit of One Component Transmitter.

 Here is a projecthat should be constructed by those with no patience for

electronics building. Only one component is used to build a complete wireless transmitter!

Of course, this is the simplest way to generate radio signals. ltis a CW (contlnuous wave) transmitter and is powerful enough to plunk down a signal

anywhere on the 550 kHz to 7 MHz band.

The fundamental frequency depends upon power supply voltage and is in the

range between 100 kHz and 1 MHz, but there are strong harmonics reaching

up to 7 MHz.

Figure / shows the schematic diagram of this simple tramsmitter. As you can

see, we have only one component: a 4049 CMOS lC that is formed by six

inverters. ln this project only five inverters are used.

The circuit is powered from AA cells or battery and current drain is very low.

As an experimental project you can place the lC on a universal solderless

board. The antenna is a single wire 2 to 5 feet long.

A common AM (medium wave or short wave) receiver is placed near the

transmitter. A signal can be tuned in from distances up to some feet away.

There are two ways to tune the transmitter, shownin Figure 2.

In the first case, as the frequency is voltage-dependent, we change the power

supply voltage. Use a 12 volt power supply and adjusthe voltage in the lC

with P1. In the second case, we include a variable capacitor in the feedback

loop to alter the frequency,

Parts List - One-Component Transmitter

lC - 4069 or 4049 CMOS integrated circuit (only this!)

(And a power supply, of course)