Schematic Diagrams

Useful schematic and wiring diagrams. ✔ ✔ Enjoy electronic circuits, let your idea comes to hardware

Circuit Diagrams

Automatic fading lights

Suitable for 230V incandescent bulbs Circuit diagram: Parts: R1_____________470R 1/2W Resistor R2,R3___________10K 1/4W Resistors R4,R12__________22K 1/4W Resistors R5_____________220K 1/4W Resistor R6_______________2M2 1/2W Trimmer (Carbon or Cermet) (Optional, see text) R7,R9,R14________4K7 1/4W Resistors R8_____________100K 1/4W Resistor (See text) R10______________1K 1/4W Resistor R11____________Photo resistor (Any type, but see Notes) R13____________470K 1/2W Trimmer (Carbon or Cermet) C1_____________330nF 400V […]

Bar-mode Lights Sequencer

Can drive up to 15 LEDs or LED-clusters Circuit diagram: Parts: R1,R5,R9_________1K 1/4W Resistors R2______________33K 1/4W Resistor R3_____________100K 1/2W Trimmer Cermet R4_______________1M 1/4W Resistor R6,R10__________10K 1/4W Resistors R7,R8___________22K 1/4W Resistors R11______________4K7 1/4W Resistor R12_____________33R 1/4W Resistor (See Notes) C1______________10µF 25V Electrolytic Capacitor C2_____________100nF 63V Polyester Capacitor C3_____________470µF 25V Electrolytic Capacitor D1–D14________LEDs (See Notes) Q1___________2N3819 General-purpose […]

Modular Headphone Amplifier

140mW into 32 Ohm loads Circuit diagram: Parts: P1______________47K Log. Potentiometer (twin concentric-spindle dual gang for stereo) R1_______________4K7 1/4W Resistor R2______________12K 1/4W Resistor R3,R4___________33R 1/4W Resistors R5,R6____________4R7 1/4W Resistors C1_______________1µF 63V Polyester Capacitor C2,C5__________100nF 63V Polyester Capacitors C3,C6___________22µF 25V Electrolytic Capacitors C4,C7_________2200µF 25V Electrolytic Capacitors IC1__________NE5532 Low noise Dual Op-amp IC2___________78L09 9V 100mA Positive Regulator […]

Modular Phono Preamplifier

High Quality Moving Magnet Pick-up module Circuit diagram: Parts: R1_____________270R 1/4W Resistor R2_____________100K 1/4W Resistor R3_______________2K2 1/4W Resistor R4______________39K 1/4W Resistor R5_______________3K9 1/4W Resistor R6_____________390K 1/4W Resistor R7______________33K 1/4W Resistor R8______________75K 1/4W Resistor (or two 150K resistors wired in parallel) R9_____________560R 1/4W Resistor C1_____________220pF 63V Polystyrene or Ceramic Capacitor C2_______________1µF 63V Polyester Capacitor C3______________47µF 25V […]

Car Battery Saver

Prevents the complete discharge of the battery Circuit diagram: Parts: R1______________10M 1/4W Resistor R2______________10K 1/4W Resistor C1______________47µF 25V Electrolytic Capacitor IC1____________7555 or TS555CN CMos Timer IC D1___________1N4148 75V 150mA Diode Q1____________BD681 100V 4A NPN Darlington Transistor LP1___________Existing Lamp Bulb, usually 12V 5W SW1____________SPST Existing Door-Switch SW2____________SPST Existing Bypass Switch Comments: I recently forgot to close […]

Modular Preamplifier Tone Control

Bass and Treble Controls Circuit diagram: Parts: P1,P2___________10K Linear Potentiometers (twin concentric-spindle dual gang for stereo) R1_____________100K 1/4W Resistor R2,R6___________18K 1/4W Resistors R3_______________3K3 1/4W Resistor (18K for shelving curves: see Notes) R4,R5____________1K8 1/4W Resistors (10K for shelving curves: see Notes) R7_____________560R 1/4W Resistor C1_______________1µF 63V Polyester Capacitor C2_______________4n7 63V Polyester Capacitor (3n3 for shelving curves: […]

Cell-Phone calling Actuator

Drives a relay when an incoming call is detected Circuit diagram: Parts: R1,R3,R4,R6______1M 1/4W Resistors R2_______________3K9 1/4W Resistor R5,R8____________1K 1/4W Resistors (Optional: see Text) R7______________10K 1/4W Resistor C1_____________100nF 63V Polyester or Ceramic Capacitor C2_______________1µF 63V Polyester or Electrolytic Capacitor C3______________10µF 25V Electrolytic Capacitor C4______________10nF 63V Polyester or Ceramic Capacitor C5_____________470µF 25V Electrolytic Capacitor D1,D4_________1N4148 75V […]

45 Watt Class B Amplifier

45W into 8 Ohm – 69W into 4 Ohm Circuit diagram: Parts: R1______________18K 1/4W Resistor R2_______________3K9 1/4W Resistor R3,R6____________1K 1/4W Resistors R4_______________2K2 1/4W Resistor R5______________15K 1/4W Resistor R7______________22K 1/4W Resistor R8_____________330R 1/4W Resistor R9,R10__________10R 1/4W Resistors R11,R12_________47R 1/4W Resistors R13_____________10R 1W Resistor C1_______________1µF 63V Polyester Capacitor C2_____________470pF 63V Polystyrene or Ceramic Capacitor C3______________47µF 25V Electrolytic […]

Modular Preamplifier Switching Center

Four high level inputs Circuit diagram: Parts: R1,R2,R3,R4____100K 1/4W Resistors R5_____________560R 1/4W Resistor SW1,SW2________2 poles 4 ways Rotary Switches J1 to J6_______RCA audio input sockets Comments: This module can be a necessary addition to the Modular Preamplifier Control Center when more than two sources need to be connected to the preamplifier chain. Four high level […]

Modular Preamplifier Control Center

Volume and Loudness controls Circuit diagram: Parts: P1______________47K Log. Potentiometer (twin concentric-spindle dual gang for stereo) R1,R2,R4_______100K 1/4W Resistors R3,R14_________560R 1/4W Resistors R5_______________1K 1/4W Resistor R6,R7,R10_______10K 1/4W Resistors R8,R9___________22K 1/4W Resistors R11_____________68K 1/4W Resistor R12______________1K5 1/4W Resistor R13_____________12K 1/4W Resistor C1_______________1µF 63V Polyester Capacitor C2,C3__________100pF 63V Polystyrene or Ceramic Capacitors C4______________47nF 63V Polyester Capacitor C5______________22nF […]

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