10 Watt Amp Express PCB File 

Micro fm Bug Download in pdf format

Phone line controllerIt might be “yet another” «device» controller that operates over phone-line, but this one works for sure The task was to build a device that connects to the phone line and has a relay as an output switch. It should also sense if the connected «consumer» is turned-on or off and report to [...]

Parts:R1-3-5-8-10=1Kohm C1=2.2uF 63V TR1=10K TrimmerR2-7-11=100Kohm C2=4.7uF 25V D1-2=IN4002R4-6=4.7Kohm C3-17=47uF 63V IC1=LM391R9-12=100ohm C4-8-9=1nF 100V MKT Q1=BD139R13=47Kohm C5=47nF 100V MKT Q2=BD140R14-15=0.15ohm 5W C6=22pF ceramic Q3=TIP2955R16=1ohm 2W carbon C7-11-12-13=100nF 100V Q4=TIP3055R17=10ohm 1W carbon C10=22pF ceramic L1=See text A power amplifier that is based on the LM391, that is a complete driver of power transistors. It does not need [...]

This FM transmitter attaches in series to one of your phone lines. When there is a signal on the line (that is, when you pick up the handset) the circuit will transmit the conversation. In particular it will radiate from the phone line itself. It is a passive device – there is no battery. It [...]

The important part of the circuit is formed of the Colpitts type oscillator. C3,C4,C5,C6,CD1-CD2 and L1 determines the frequency. BF982 and dual gate MOSFET are active parts in oscillator. When the input impedance of the MOSFET gate inputs are high, LC tank is not affected. However transistors force the LC tank and cause phase shift. [...]

R1, R101 56 kOhm C1, C101 47 µF/6,3 V, elektrolyt.R2, R11, R102, R111, R16 12kOhm C2, C102 100 nF, fóliovýR3, R103 22 kOhm C3, C103 1 nF, fóliovýR4, R104 6,8 kOhm C4, C104 1 až 3,3 µF/elektrolyt. 16 V nebo fóliovýR5, R105 220 Ohm C5 15 až 22 µF/25 V, elektrolyt.R6, R106 47 kOhm C6 [...]