Matt circuit

Used ICs: JRC4558, TDA7266SA, NCP1606B, LD7531, 5A500V[FET], SG3525, LM358,  Audio output SMPS [Click on the schematics to zoom]

Here is a circuit of a flasher which I designed for automotive use. It has a built-in function of lamp-outage detection. In normal operation, it will flash at about 1.4Hz and when a lamp goes bad, the flash-rate is doubled. The flashers faster clicking sound and the dashboard indicators faster flashing attracts the drivers attention that one of the bulbs has gone out.  Automotive Turn Flasher with lamp  output Detection Notes The circuit consists of two parts - the flashing unit and the lamp outage detection module. The flashing unit is built around 555 timer configured as an astable multivibrator. The resistors R12/R13 and capacitors C3/C4 sets the required frequency. Note that C3 is connected in parallel to C4 through BC547 an NPN transistor, acting as a switch. When there is positive voltage at the base of the transistor, it conducts and connects C3 to ground. C3 & C4 in parallel doubles the capacitance value i.e. 220nF + 220nF = 440nF. This capacitance value together w...

MOSFET Audio Amplifier circuit 70 Watt power output This is use the MOSFET power amplifier circuit, amplifier circuit has a very good sound quality. With the noise is quite small, thus making the amplifier circuit is suitable for you to try. Here's the circuit. Click to view larger.  Power amplifier with a 70Watt power is able to issue a clear voice, and very and good loud.

Samsung 32 inch CRT TV - power and audio output circuit diagram SMPS Sub-power Audio output Click on the schematics to magnify