Radio circuit diagrams electronics projects for radio transmitter, radio receiver circuit, rf amplifiers, rf boosters and some other related RF circuits like: fm antenna booster, microwave transmitter and wireless modules.
ThisAM radio receiver circuit is based on the TEA5551T monolithic integrated radio circuit which is designed for use as a portable radio receiver with headphones .
The design of the circuit is very simple and require few external components .
The TEA5551T radio receiver circuit contains all is needed for a AM radio receiver circuit (a complete AM part and dual AF amplifier with low quiescent current).
The TEA5551T support a input voltage range (VS) from 1.8 V to 4.5 V but the typical voltage is 3 volts .
Main features of the TEA5551T are : low voltage operation (VS = 1.8 V to 4.5 V) , low current consumption (Itot = 5 mA at VS = 3 V) , all pins provided with ESD protection AM part , high sensitivity (Vi = 1.5 mV for Vo = 10 mV) , good IF suppression , dood signal handling (Vi(max) = 80 mV) , switch for AM or other applications , short waveband (> 40 MHz) AF part , fixed integrated gain of 32 dB , few external components required , very low quiescent current , low HF radiation and good AF overdrive performance , 0 to 20 kHz limited frequency response , 25 mW per channel output power in 32 ohms load.
Because in most case we don’t find to buy inductors you need to build the inductors L1 , L2 , L3 . In the picture bellow you can see the construction data for these three inductors .
MAX7036 is a low-cost receiver designed to receive amplitude-shift-keyed (ASK) and on-off-keyed (OOK) data in the 300MHz to 450MHz frequency range. The MAX7036 integrates the IF filter on-chip and therefore eliminates an external ceramic filter. Max7036 also contains an on-chip automatic gain control (AGC) that reduces the LNA gain by 30dB when the input signal power is large.
The MAX7036 operates from a 5V or a 3.3V power supply and draws 5.5mA (typ) of current.
The TDA7000 Fm receiver from this circuit is based on the TDA7000 fm radio ic which is a monolithic integrated circuit designed for mono FM portable radios .
Using TDA7000 fm radio ic can be designed with a minimum of external components a high performance and small FM radio receiver .
The TDA7000 has an FLL (Frequency-Locked-Loop) system with an intermediate frequency of 70 kHz and the selectivity is obtained by active RC filters. The only function which needs “calibration” is the resonant circuit for the oscillator (for the reception frequency ).
Main features of this fm radio receiver ic are : R.F. input stage , Mixer , Local oscillator ,I.F. amplifier/limiter ,Phase demodulator , Mute detector ,Mute switch .
Using an integrated device like in this project in your FM radio can eliminate LC tuned circuits from the RF, IF, local oscillator and demodulator stages. A way to eliminate the coils in the IF and demodulator stages is to reduce the normally used intermediate frequency of 10.7MHz to a frequency that can be tuned by active RC filters.
This fm radio receiver can also be used as receiver in equipment such as cordless telephones, CB radios, radio-controlled models, paging systems etc.
This fm radio receiver circuit needs a 4.5 volts power supply .
For AF amplifier you can use the circuit below or an integrated amplifier like TDA7052 amplifier , Tda1011 or others .