Keypad-Operated Switch No.2
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Dark and Light Activated Relay
The potentiometer adjusts the trigger level. The diode in the circuit diagram is specified as 1N914, which is suitable for light-duty relays; however, since the 1N914 is a signal diode, it is not ideal. A 1N4001 or a better alternative...
Can effectively guarantee the auto-voltage starting circuit main contact of extinction
The circuit illustrated in Figure 3-56 features both manual and automatic start-up modes. It incorporates two relays, KA2 and KA3, within the control loop. The circuit design ensures that KM1 is cut off before and after activating KM2. A main...
Audio Amplifier Diagram
The circuit is based on four integrated circuits: TL072, TL074, MN3101, and MN3004, which produce four output channels for surround audio, specifically targeting center, rear, front right, and front left audio. It is a compact amplifier capable of delivering 7W...
Constant Voltage Speaker Measurement Circuit
If the offset value exceeds 5mV, adjust this value by experimenting with resistors, starting with 220K, connected from test point Z (the junction of R22 and R23) to +V if there is a negative voltage, or to -V if there...
Delay circuit for a long time periods ( 4060 )
If you need a timer circuit, we go after the most proven 555. However, if the delays are longer, based on timing capacitor capacity is too large. In this case, a circuit of Figure 1 After pressing the button -...
Universal Four-Digit Keypad-Operated Switch - Construction Details
The key connected to "E" is used to energize the relay, while the four keys connected to A, B, C, and D are used to de-energize it. All other keys on the keypad are connected to "F". When "E" is...
3-channel Audio Amplifier circuit
A careful examination of the amplifier photos reveals that the heatsink on the HY60 near-clone built using the TDA2050A is slightly shorter than that of the original HY60s. This unit is positioned at the rear of the amplifier, creating a...
Miniature Audio Amplifier Circuit
This miniature audio amplifier provides an output of up to 250mW and can function as a final stage audio amplifier for radio sets. The schematic is straightforward, featuring one BC transistor.
The described miniature audio amplifier is designed for efficient amplification...
mains ac relay module
This mains AC relay module utilizes 5V relays that can be powered directly from an Arduino and can switch 230V. A basic energy monitoring and control system has been constructed using an Arduino 2009, off-the-shelf wireless remote control sockets, and...