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Electronics Schematic Diagram alarm Door Bell circuit using IC UM 66 part 1

This is a slight modification of that circuit. In the previous circuit you have to keep the switch pressed for making the IC play the full music. Here if once the push button is pressed C1 is charged and the transistor Q2 will keep the IC playing the music till it ends. The time for […]

Make Wireless portable with CA3140,4069,4098

Parts: R1,R2,R19_______1K 1/4W R3-R6,R13,R17_100K 1/4W R7,R15__________1M 1/4W R8_____________50K 1/2W R9____________470R 1/4W R10___________470K 1/4W R11___________100K 1/2W R12___________220K 1/4W R14,R16________68K 1/4W R18____________22K 1/4W R20___________150R 1/4W C1,C7_________100µF 25V C2,C3_________330nF 63V C4-C6___________4µ7 25V D1,D5______Red LEDs D2,D3________1N4148 75V D4________BZX79C7V5 7.5V 500mW IC1__________CA3140 or TL061 IC2____________4069 IC3____________4098 or 4528 Q1,Q2_________BC238 25V 100mA NPN L1_____________10mH miniature Inductor BZ1___________sounder (incorporating 3KHz oscillator)

Mini Mixer

Mini Mixer Mini Mixer circuit using BC550C, BC547, BC557 Mini Mixer circuit using BC550C, BC547, BC557 Mini Mixer P1,P2,P3______5K R1,R11,R15____180K 1/4W R2,R12,R16____2M2 1/4W R3,R13,R17____750R 1/4W R4,R14,R18____1K 1/4W R5____________15K 1/4W R6____________220R 1/4W R7____________1K5 1/4W R8____________820R 1/4W R9____________150R 1/4W R10___________100K 1/4W C1,C6,C8______1µF C2,C4,C7,C9___100µF C3,C5_________220µF Q1,Q4,Q5______BC550C Q2____________BC547 Q3____________BC557

Circuit Diagram 15W EL84 Power Amp and a Transformer power supply Schematic

Circuit Diagram 15W EL84 Power Amp and a Transformer power supply Schematic Circuit Diagram 15W EL84 Power Amp and a Transformer power supply Schematic

Variable PC power supply Circuits

Variable PC Power Supply Circuits variable variable Power Supply Circuits Many alternatives abound where a HeNe laser power supply must be constructed from scratch. Decisions must be made based on the size or range of sizes of the HeNe tube(s) to be powered, convenience, need for portability (well in a relative sort of way), availability […]

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