diff --git a/src/pcb_calculator/pcb_calculator.adoc b/src/pcb_calculator/pcb_calculator.adoc index 552e9451..dce1ab9a 100644 --- a/src/pcb_calculator/pcb_calculator.adoc +++ b/src/pcb_calculator/pcb_calculator.adoc @@ -38,15 +38,15 @@ Please direct any bug reports, suggestions or new versions to here: [[publication_date_and_software_version]] *Publication date and software version* -march 04, 2019 +july 17, 2019 [[introduction]] == Introduction -The Kicad Calculator gives you the Chance to calculate the most important Things without leaving Kicad. - -The Calculator consists the following Options: +The KiCad PCB Calculator is a set of utilities to help you find the values of +components or other paremeters of a layout. The Calculator has the following +tools: * Regulators * Track Width @@ -69,25 +69,25 @@ needed for linear and low-dropout voltage regulators. image::images/en/regulators.png[alt="Regulators",scaledwidth="80%"] -For the _Standard Type_, the output voltage V_out as a function of the reference voltage V_ref and resistors R_1 and R_2 is given by: +For the _Standard Type_, the output voltage Vout as a function of the reference voltage Vref and resistors R1 and R2 is given by: image::images/Calculation1.png[alt="Regulators",scaledwidth="20%"] -For the _3 terminal type_, there is a correction factor due to the quiescent current I_adj flowing from the adjust pin: +For the _3 terminal type_, there is a correction factor due to the quiescent current Iadj flowing from the adjust pin: image::images/Calculation2.png[alt="Regulators",scaledwidth="20%"] This current is typically below 100 uA and can be neglected with caution. -To use this calculator, enter the parameters of the regulator _Type_, _V_ref_ and, if needed, _I_adj_, select the field you want to calculate (one of the resistors or the output voltage) and enter the other two values. +To use this calculator, enter the parameters of the regulator _Type_, _Vref_ and, if needed, _Iadj_, select the field you want to calculate (one of the resistors or the output voltage) and enter the other two values. [[track-width]] === Track-Width -The Track Width calculator calculates the trace width for printed circuit board conductors for a given current. +The Track Width tool calculates the trace width for printed circuit board conductors for a given current and temperature rise. It uses formulas from IPC-2221 (formerly IPC-D-275). @@ -97,10 +97,12 @@ image::images/en/trackwidth.png[alt="Track-Width",scaledwidth="80%"] [[electrical-spacing]] === Electrical-Spacing -In the Picture you can see that you can edit the Voltage and the Calculator gives you the correct Values. - -The minimal Values which orientatd at the IPC-2221 too. +This table helps finding the minimum clearance between conductors. +Each line of the table has a minimum recomended distance between conductors +for a given voltage (DC or AC peaks) range. If you need the values for voltages +higher than 500V, enter the value in the box in the left corner and press +_Update Values_. image::images/en/electricalspacing.png[alt="Electrical-Spacing",scaledwidth="80%"] @@ -138,14 +140,16 @@ image::images/en/transline.png[alt="TransLine",scaledwidth="80%"] [[rf-attenuators]] === RF-Attenuators -With the RF Attenuator you can calculate different things by choosing: +With the RF Attenuator utility you can calculate the values of the resistors +needed for different types of attenuators: * PI * Tee * Bridged Tee * Resistive Splitter -and change all their Parameters. +To use this tool, first select the type of attenuator you need, then enter the +desired attenuation (in dB) and input/output impedances (in Ohms). image::images/en/rfattenuators.png[alt="RF Attenuators",scaledwidth="80%"]