Search Results
Field strength meter
This circuit measures the strength of a radiated signal from a transmitter. It is commonly used by model airplane builders to check whether their transmitter are really transmitting the radio signal. Using this FS meter, one can quickly determine whether the problem lies on the transmitter or the receiver module.
A single transistor T1 is the [...]
DX audio filter
Most universal radio receivers have a very wide bandwidth that is not particulary for radio amateurs. The better models with narrower bandwith are almost always priced higher, too high for the reach of an average radio hobbyist.
However, if one wants to use a wide bandwidth receiver to listen to amateur SSB and CW stations with [...]
2 transistor radio receiver
This circuit is also called “mini-radio”. It uses only 2 transistors and few passive components which makes is very easy to be constructed. Although the circuit is very simple, it functions very well without external antenna or ground connection. The transistor T1 works as a feedback regulated HF-amplifier and function as demodulator at the same [...]
