TECHNICAL CHARACTERISTICS:

Stabilised tendency of catering: Vcc=9~12V

Frequency of reception: 88~108MHz

Consumption: 100mA

Materially:

The resistances are 1/4W.

R1	47K
R2	22K
R3	100K
R4	39K
R5	10
R6-r12	7,5K - Optionally
R13-r21	15K - Optionally
P1	10K Logarithmic potentiometer
P2	100K Linear potentiometer
C1	39pF Ceramic
C2	47pF Ceramic
C3	2,2nF Polyester
C4, c14	220nF Polyester
C5	22nF Polyester
C6	10nF Polyester
C7, c18	180pF Ceramic
C8	150pF Ceramic
C9	100nF Polyester
C10, c13	330pF Ceramic
C11	220pF Ceramic
C12, c16	3300pF Ceramic
C15, c17	1800pF Ceramic
C19, c21, c22	10mF/16V electrolytic
C20	10nF Polyester
C23	47nF Polyester
C24, c25	470mF/16V electrolytic
L1, l2	5 Coils linked with internal diameter 4mm from cupreous isolated wire 0,6mm.
IC1	TDA7000 with base DIL18
IC2	LM7805
IC3	LM386 with base DIL 8
D1	BB329 or BB105 or other than old tuner televisions.
SPEAKER	Loudspeaker 8W/1W.
S1	Switch of catering.
AERIAL	50cm isolated wire
CONNECTOR DB25	Fastener of 25 pin parallel door PC (LPT) -Optional

 

REGULATIONS:

A) With the P1 we regulate the intensity of sound.

B) With the P2 we regulate the frequency of reception.

C) Optionally: If you want to check the frequency with your PC it will be supposed you make the following energies:

- You assemble and the circuit that is in the blue frame.

- You cut the driver dj'pla in point A, as it appears in the circuit and you connect points A,V.

- If you know some language of programming as C ++, PASCAL, VISUAL BASIC, DELPHI etc you can write a program which will send in the parallel door (378 I) of PC a number from 0 until 255 checking thus the tendency of expense of simple D/A of converter (that it is in blue frame) and consequently and frequency of radio via passage VARICAP.

(As long as grows the number that sends in the parallel door, so much minimizes the frequency that receives the radio.)

Notes:

Download DOS control program here.

You can also try this one: http://www.geekhideout.com/downloads/parmon.zip

Also check the conversation about this project at the community. Post you questions here.