# Amplifier Timer Circuit Schematic

Schematic Diagrams      Comments Off on Amplifier Timer Circuit Schematic

Turns-off your amplifier when idle for 15 minutes, Fed by amplifier tape-output This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1…. Read more »

# RPM Sensor Module For Robotics w/ UGN3503

Schematic Diagrams      Comments Off on RPM Sensor Module For Robotics w/ UGN3503

If you are in a plan to build your own speedometer for your next robotic vehicle, ofcourse you need an RPM sensor to complete the task. Today, almost all sensor modules for use with microcontrollers are readily available in pre-wired form. OK, but how about building your own? If you… Read more »

# Continuity Tester Circuit Differentiates Resistance

Schematic Diagrams      Comments Off on Continuity Tester Circuit Differentiates Resistance

This simple but clever continuity tester sports two LEDs: RED LED = circuit resistance is < approx 10K, GREEN LED = circuit resistance

# Vending Machine Drop Sensor Circuit

Schematic Diagrams      Comments Off on Vending Machine Drop Sensor Circuit

Microcontrollers come in all sorts and sizes, and it’s very tempting to use them everywhere. If you are in a plan to build your own Vending Machine, probably you need a microcontroller-compatible Drop Sensor circuit. In a commercial vending machine, its delivery chute uses a drop (vibration) sensor to detect… Read more »

# The telephone pickup small amplifiers using LM358

This circuit is the telephone pickup small amplifiers for To expand the voice conversation louder. or intercepted phone call. It use pickup telephone and LM358 op-amp IC as preamplifier and LM386 out to speaker and use 9V battery Low power consumption. The working principle The complete circuit of the The… Read more »

# Laser Dioda Power Supply

Schematic Diagrams      Comments Off on Laser Dioda Power Supply

The electrical circuit of the power supply of the laser diode is shown in the picture: Diode laser has three pins and consists of (a diode that emits a laser beam), and control the photodiode, which is designed to control power output. Anode and cathode of the diode laser is… Read more »

# One LED flasher by transistors-UJT-SCR-LM358

Schematic Diagrams      Comments Off on One LED flasher by transistors-UJT-SCR-LM358

This circuit is a simple circuit using only capacitor C1.Resistors R1 frequency generator to Q1.Which acts like a switch.then used Q2 to be the current increase. Operation of this circuit from capacitor C1 through R2 and LED1. Until the voltage drop at C1 increases,Q1 to the value that work. As… Read more »

# Timer control 1-15 minutes by Triac 2N6075 and LM555-LM358

Schematic Diagrams      Comments Off on Timer control 1-15 minutes by Triac 2N6075 and LM555-LM358

Most timer circuits. Often used with electrical transformers containing low as 9V and 12V, and use of electrical control relays.but the 1-15 minute timer circuit.It uses a triac instead of electrical control.This can be used with a 220V power house it is not connected to the transformer. Make smaller and… Read more »

# One LED flasher by transistors-UJT-SCR-LM358

Schematic Diagrams      Comments Off on One LED flasher by transistors-UJT-SCR-LM358

This circuit is a simple circuit using only capacitor C1.Resistors R1 frequency generator to Q1.Which acts like a switch.then used Q2 to be the current increase. Operation of this circuit from capacitor C1 through R2 and LED1. Until the voltage drop at C1 increases,Q1 to the value that work. As… Read more »

# One LED flasher by transistors-UJT-SCR-LM358

Schematic Diagrams      Comments Off on One LED flasher by transistors-UJT-SCR-LM358

This circuit is a simple circuit using only capacitor C1.Resistors R1 frequency generator to Q1.Which acts like a switch.then used Q2 to be the current increase. Operation of this circuit from capacitor C1 through R2 and LED1. Until the voltage drop at C1 increases,Q1 to the value that work. As… Read more »