Reduce your the power in steps of 3 dB, from 0 dB to 36 dB, with this easy to build power attenuator,
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Resistor value for 20 dB
The resistors R1 to R3 are compound resistors. They are made, by placing two or more resistors from the E12-series in parallel.
R1 and R3 both have a value of 61.11 ohms.
R2 has a value of 247.5 ohms. These values are typical for the 20 dB attenuators.
Power distribution
The higher the power the more resistors must be used. The resistors are placed in parallel.
With a continuous input power of 5 watts, R1 has to dissipate 4.1 watts. R2 has to dissipate 0.8 watts and R3 only 40 mW.
Designing your own 20 dB Attenuator
The table below gives the number of resistors and there value, for an attenuator of 20 dB , built with resistors of a half watt. The higher the continuous maximum input power, the more resistors are needed. So for instance in an attenuator for a continuous input power of 2.2 watts, R1 consists of 3 resistors of 220 ohms and one resistor of 390 ohms, ALL in parallel. R2 is 270 ohms in parallel with 3300 ohms and R3 is 68 ohms parallel to 560 ohms.
Power distribution
The higher the power the more resistors must be used. The resistors are placed in parallel.
With a continuous input power of 5 watts, R1 has to dissipate 4.1 watts. R2 has to dissipate 0.8 watts and R3 only 40 mW.
Designing your own 20 dB Attenuator
The table below gives the number of resistors and there value, for an attenuator of 20 dB , built with resistors of a half watt. The higher the continuous maximum input power, the more resistors are needed. So for instance in an attenuator for a continuous input power of 2.2 watts, R1 consists of 3 resistors of 220 ohms and one resistor of 390 ohms, ALL in parallel. R2 is 270 ohms in parallel with 3300 ohms and R3 is 68 ohms parallel to 560 ohms.
10 dB attenuator.
Resistor values and power distribution for a 10 dB attenuator, with a continuous input power of 5 watts.
3 dB attenuator.
Resistor values and power distribution for a 3 dB attenuator, with a continuous input power of 5 watts.
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