Tuesday, July 30, 2013
Sound Generator for Alarm
This is sound generator circuit.You can use this circuit for your alarm circuits.Here I have used common IC 4011.This circuit gives about 10W through a 8 ohm speaker.This circuit can be control (on and off) with sw1.
Note
# Use 12V smooth power supply for this
# Build this on a PCB
#If you are unable to find IC 4011 you can use Ic MC14011 or TC14011
[Continue reading]
Note
# Use 12V smooth power supply for this
# Build this on a PCB
#If you are unable to find IC 4011 you can use Ic MC14011 or TC14011
Monday, July 29, 2013
How to Build 12 Volt DC Fluorescent Lamp
A number of people have been unable to find the transformer needed for the Black Light project, so I looked around to see if I could find a fluorescent lamp driver that does not require any special components. I finally found one in Electronics Now. Here it is. It uses a normal 120 to 6V stepdown transformer in reverse to step 12V to about 350V to drive a lamp without the need to warm the filaments.
Parts:
C1 100uf 25V Electrolytic Capacitor
C2,C3 0.01uf 25V Ceramic Disc Capacitor
C4 0.01uf 1KV Ceramic Disc Capacitor
R1 1K 1/4W Resistor
R2 2.7K 1/4W Resistor
Q1 IRF510 MOSFET
U1 TLC555 Timer IC
T1 6V 300mA Transformer
LAMP 4W Fluorescent Lamp
MISC Board, Wire, Heatsink For Q1
Notes:
Parts:C1 100uf 25V Electrolytic Capacitor
C2,C3 0.01uf 25V Ceramic Disc Capacitor
C4 0.01uf 1KV Ceramic Disc Capacitor
R1 1K 1/4W Resistor
R2 2.7K 1/4W Resistor
Q1 IRF510 MOSFET
U1 TLC555 Timer IC
T1 6V 300mA Transformer
LAMP 4W Fluorescent Lamp
MISC Board, Wire, Heatsink For Q1
Notes:
- Q1 must be installed on a heat sink.
- A 240V to 10V transformer will work better then the one in the parts list. The problem is that they are hard to find.
- This circuit can give a nasty (but not too dangerous) shock. Be careful around the output leads.
Subscribe to:
Posts (Atom)