1.5… 4.5V to 9V converter

                      1.5… 4.5V to 9V converter

                       


3 volts to 9 volts with LMC555

This DC converter is constructed using the CMOS version of the 555 timer. You can get too if you change 12V Zener diode to a 12V version.

555 ON/OFF Touch Switch

                                   555 ON/OFF Touch Switch

Components List

R1 = R2 = 3.3M
R3 = 10K
R4 = 1K
C1 = 10nF
D1 = 1N4007
Q1 = BC547
IC = NE555
12V relay

This touch switch ON OFF circuit is based on known timer IC 555 , which actuates a relay which acts as a switch. Metal surfaces may be the way we want, but it must be clean and close the circuit.

Tap plate MP1 in order to close the relay contact RL1 [ON] or MP2 board to open the contact RL1 [OFF]. The D2 LED lights when the contacts of RL1 closed. Two small pieces of metal can be used as sensor plates.

the Water Alarm Circuit

                                       The Water Alarm Circuit

It's just a water sensor, which can be configured as an Alarm Indicator tank overflow alarm rain water leakage from aquarium water, etc. It can be powered from any supply 6VDC. Initially, when the DC power supply circuit, the red LED is off. However, it detects when the presence of water between the detection probes (s1, s2), the LED blinks at a slower pace.

Light sensitive switch

Light sensitive switch

Light sensitive switch with LDR, actually it has a buzzer which will sound .

Police Car Lights circuit

This square wave is damped by IC1b and in turn drives decade counter IC2. The outputs of the counter Q0/Q2 and Q7/Q9 are diode ORed turn to alternating double pulses.

C2 and C3 with R5 and R3 differ pulse time in conjunction with the output drivers and IC1C IC1F. This produces a short pulse (30 ms) increases the effect of flash and adds to the illusion. Output drivers turn drive a pair of blue leds hyperbright D5 and D6.