Table Lamp Circuit by IC 555

If you want a Power Lamp Flasher at normal electric power, try out Table Lamp Circuit like this is. It uses the integrated circuit NE555 as the core component. It controls the blink rate of the lamp. Use the power transistor for about 20W or current 1.6A. The Q3 can be replaced by TIP41 or H1061 or MJ3055 or 2N3055 .

Inverter DC to AC

Sometime we go to camping, fishing and make some out door activity that need electricity, then we can overcome this problem by using gasoline or diesel generator sets. It is all right if we can handle this equipment. But if its weight is a problem too, then we need light AC power supply. A light AC power supply is realized by DC to AC inverter.

Basically, DC to AC inverter work by using control circuit to generate electric pulse at high power (typically at hundred to thousand watts) and then this high power pulse is connected to step up transformer to get high voltage, i.e. 220 volt. For example, this control circuit can be realized using microcontroller circuit as seen at figure1. By using a microcontroller, the generated pulse can be formed in modified sine wave by using pulse width modulation technique. We can built simple inverter using unstable multivibrator as be explained in simple inverter's page.

In this circuit, AT89C2051 (belong to AT89 series) is used to generate pulse that is used for MOSFET IRFZ 44 driving. This mosfet switched on and off DC current to low side voltage transformer. The high voltage is generated at the other side that can turn on the lamp. To get a higher power, we can add more mosfet in parallel connection.

DC to AC Inverter using 555

Inverter DC ke AC Menggunakan IC 555


This DC-to-AC inverter schematic produces an AC output at line frequency and voltage. The 555 is configured as a low-frequency oscillator, tunable over the frequency range of 50 to 60 Hz by Frequency potentiometer R4.

The 555 feeds its output (amplified by Q1 and Q2) to the input of transformer T1, a reverse-connected filament transformer with the necessary step-up turns ratio. Capacitor C4 and coil L1 filter the input to T1, assuring that it is effectively a sine wave. Adjust the value of T1 to your voltage.

The output (in watts) is up to you by selecting different components.

Input voltage is anywhere from +5V to +15Volt DC, adjust the 2700uF cap's working voltage accordingly.
Replacement types for Q1 are: TIP41B, TIP41C, NTE196, ECG196, etc. Replacement types for Q2 are: TIP42B, TIP42C, NTE197, ECG197, etc. Don't be afraid to use another type of similar specs, it's only a transistor... ;-)

Parts List:

R1 = 10K
R2 = 100K
R3 = 100 ohm
R4 = 50K potmeter, Linear
C1,C2 = 0.1uF
C3 = 0.01uF
C4 = 2700uF
Q1 = TIP41A, NPN, or equivalent
Q2 = TIP42A, PNP, or equivalent
L1 = 1uH
T1 = Filament transformer, your choice

If the whole thing is working, good. If not, relax and don't get frustrated. Do the following checks:

1. You have connected the filament transformer in REVERSE yes?
2. If not, disconnect the power and reverse. If you have, disconnect the transformer and measure the voltage after L1 and ground.
3. Just in case, GROUND for this circuit is same as negative (-).
4. Q1/Q2 are oposites, e.i. npn/pnp.
5. Is your 555 perhaps defective? Disconnect R3 from pin 3 and check pin 3 for a pulse.
6. Check your transistors to make sure they are not defective.

Error fix: Pin 7 and 2 were reversed. Original pinout was correct.



Rangkaian Inverter DC-AC ini menghasilkan tegangan keluaran AC seperti tegangan jala-jala. IC 555 dikonfigurasikan sebagai osilator frekuensi rendah. Frekuensi bisa diubah dari 50 ke 60 Hz dengan mengubah potensiometer frekuensi R4.