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Category: Inside Circuits Views: 5436 Rank: 0 You can use that circuit to drive a relay of 12 V with a trigering signal of 5V. It uses 2 diodes 1N4002, 1 transistor 2N3904 and two resistors.  By changing the resistors value you can change the input triggering voltage.
Related circuits The signal booster, built around a few transistors and support components, offers an RF gain of about 12 to 18 dB This circuit uses a 15-kHz oscillator coil. When metal placed in the energy field is withdrawn, the oscillator voltage is rectified and compared to a reference. Digitally-programmable-attenuator The first stage is a simple buffer used to isolate the signal source from the attenuator stages to follow. Each of the subsequent stages is preceded by a voltage divider formed by two resistors and CMOS switch. Provided that the CMOS switch for each stage is closed, the drive signal will be... This thermometer is capable of measuring temperatures from - 30 to +120 °F. A diode-connected 2N3904 transistor form Half wave AC phase-controlled circuit The 5AH will trigger when the voltage across the two 0 juF capacitors reaches the breakdown voltage of the lamp. Control can be obtained full off to 95% of the half wave RMS output voltage Morse Practice Oscillator Circuit A 555 timer configured as an astable multivibrator is used in this circuit lo generate an audio note. Simple differential amplifier circuit Operational amplifiers Al and A2 are connected in a noninverting configuration of their training sorties amplifier A3. The operational amplifier A3-one could call a subtractor circuit that converts the differential signal between the floating point X and Y in a single ended output voltage .... This circuit easily supplements the current-sourcing and current-sinking capability of the CA3130 BiMOS op amp.
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[Glitch] got his hands on a slew of relays which are meant for use in industrial equipment. They are designed to operate at 24V. He wanted to use these with common microcontrollers and instead of buying a driver he designed ...
Many integrated circuits have undocumented features or abilities. This is one of them. The TLC555 output (pin 3) can sink a 100mA load to 1.28V. The open drain transistor reset (pin 7) can sink 100mA to 1V. Tying both lines together is ...
Get more knowledge on Relay Driver IC ULN2003 and its working by reading this post completely. Visit this blog regularly for latest updates on electronics.
A simple and convenient way to interface 2 relays for switching application in your project. This relay driver boosts the input impedance with a regular BC547 NPN transistor (or equivalent). Very common driver. It can drive a ...
This circuit is a relay driver that's in response to a PIC16F84A microcontroller. The board embodys 4 relays so this lets us to control 4 diverse electrical tools. The keep an eye onled instrument could also be a heater, a lamp, ...
staged turn on/turn off under normal circumstances to avoid thumps through expensive drivers; unexpected power outage - this would require a circuit that detected a loss of 230V and disconnected the speakers via relays ...
Relay Driver circuit
Relay and Driver board DIY electronics kit
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