The LM317 is often used as an adjusting element in voltage regulators. Here is an unusual application for you. With only a few external components, you can make a small 12V light bulb flash.
As shown, using the given component parameter values ​​and signals, when the circuit is turned on, the small light bulb will flash at a frequency of 4 Hz. Of course, if you change the component parameters (R2 or C2, when R2 or C2 is changed, other corresponding resistance Or the capacitance value is also changed to make it the same as R2 or C2). The frequency of the flashing will also change. To make the flashing light stop flashing, you can use the 1V voltage to drive T1.
Since the LM317 itself carries a current of 1A, the circuit can automatically limit the turn-on current, so the lamp life is quite long.
2 Flasher/light control
The circuit is a two-stage direct-coupled transistor amplifier that is connected to a self-oscillating multivibrator. Adjusting the potentiometer R1 can both change the length of the flash and change the flash interval.
3 more use flash design
The SG3909 is an integrated component that mimics the LM3909 and can be used interchangeably with the LM3909. The operating voltage can be less than 1.5V. The timing booster is used to boost the voltage and 2V pulses are sent to the LEDs.
The pinout of the SG3909 is shown in Figure 7. The SG3909 features:
1, micro-power work, a large flashlight battery can work for more than one year;
2, the power supply voltage is low, can be from 1V to 5V
3, large drive current, as the oscillator can directly drive 8Ω speaker;
4, few external components, the circuit starts from the inside, just need to add a battery and a capacitor can constitute a flasher;
5, low cost, good brightness.
FIGS. 1 to 6 show various light emitting diodes VD and incandescent lamp H flasher circuits of the SG3909. Flash frequency can be adjusted by adjusting external resistance and capacitance.
Component selection: LED VD can use the following types: BT104 (yellow), BT304 (green), BT305 (red), other LED models as long as the operating voltage of 1.5V ~ 2.5V can be used. Switch SA is KNX (1×2). The lamp H is 6.3V, 0.1A (screw) or 6.3V, 0.15A (socket). Power supply GB uses a 4F22-DC6V laminated battery, and can also use a rectified DC 6V power supply, which is more economical. Other component parameters are marked as shown in Figure 1 to Figure 6 without special requirements
1.25mm Wire To Board Connectors
1.25mm Wire To Board Connectors are avialable in different terminations and sizes intended for use on a variety of applications. These connectors provide power and signal with different body styles, termination options, and centerlines. To find the wire to board set required, click on the appropriate sub section below.
Description
1.25mm wire-to-board connector system is designed for a wide variety of applications in Industrial, Automotive, and Consumer markets.
The comprehensive range consists of terminals, crimp housings and PCB headers in straight and right angle, surface mount and through-hole configurations. It is available in 2 to 15 circuits in a single row. 1.25mm wire-to-board solution conforms to the EU Industry Safety Standard. PCB header material meets halogen-free requirements and can be operated in the temperature range from -40°C to +105°C.
Saves space with a 1.25mm pitch
Suitable for Industrial, Automotive, and Consumer markets
Crimp housing with friction feature
Conforms to EU Industry Safety Standard
Accommodates wire range up to 32AWG-28AWG
Features
Three plating versions - Tin 15μin Gold, 30μin Gold and Gold Flash
Fully polarized housings
Crimp housing with friction feature
Tape and Reel packaging with pick up cap
UL94V-0 flammability rated LCP material
Halogen-free resin material
RoHS compliant and lead-free
Benefits
Supports applications in a wide range of environments
Prevents accidental mismating
Provides additional retention and prevents harness-to-header mismating
Pick and place for SMT production process
High flammability rating
Meets environmental requirement
Meets environmental, health and safety requirement
Applications
Consumers
Car Audio
Industrial & Instrumentation
Industry Control
Instrumentation/Metering
Office Equipment
Small Motor/Robot Control
Security
Alarm Systems
Vending POS Machine
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