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PWM Modulator

PWM Modulator
If you ever thought of experimenting with pulse-width modulation, this circuit should get you started nicely. We’ve kept simplicity in mind and used a dual 555 timer, making the circuit a piece of cake. We have even designed a small PCB for this, so building it shouldn’t be a problem at all. This certainly isn’t an original circuit, and is here mainly as an addition to the ‘Dimmer with MOSFET’ article elsewhere in this issue. The design has therefore been tailored to this use.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
R1 = 270kOhm
R2,R3 = 10kOhm
R4 = 100kOhm
R5,R8 = 1kOhm
R6,R7 = 220Ohm
P1 = 2kOhm 2, linear, mono
Capacitors:
C1,C4 = 10nF
C2,C5,C6 = 100nF
C3 = 1nF
C7 = 2µ F2 63V radial
C8 = 100µ F 25V radial
Semiconductors:
D1 = 1N4002
IC1 = NE556
IC2 = 78L15
Miscellaneous:
P1 = 3-way pinheader
K1 = 2-way pinheader
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