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Short-form kit for the 0-110dB RF Attenuator

A kit for the 0-110dB Attenuator which includes the PCB, programmed microcontroller and all the other components that mount on the PCB.

All you need to add is the case, panel label, power supply, chassis-mounting DC socket(s), chassis-mounting power switch and the off-board wiring.

Note: photo shows the assembled PCB mounted in the case with off-board components that are not included in the kit.

Cat No SC6420. Price: AUD $75.00 ¹

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In stock:

yes (2 available). Estimated dispatch time: 1-3 days

Related to: Project: 0-110dB RF Attenuator (July 2022 [print issue] [online issue])

Other items relevant to this project:

Kit parts list

	10 × 2A DPDT 5V DC coil relay (EC2-5NU)
	1 × pulse-type rotary encoder with pushbutton and short 18t spline shaft switch
	1 × 10µH axial inductor
	1 × 0-110dB RF Attenuator PCB [CSE211003]
	1 × 0.96in cyan OLED with SSD1306 controller

Connectors

	2 × SMA edge connector (female, standard polarity)
	1 × 28-pin narrow DIL dual wipe IC socket (DIP-28)
	1 × 4-pin female socket (2.54mm pitch)
	1 × 3-way vertical polarised header with matching plug & pins (2.54mm pitch)
	1 × 2-way vertical polarised header with matching plug & pins (2.54mm pitch)
	1 × 2×3-pin gold-plated male header (2.54mm pitch)

Semiconductors

	1 × ATmega328P programmed with the firmware for the 110dB RF Attenuator [CSE211003.HEX]
	1 × AP7381-33V-A 3.3V 100mA LDO regulator (TO-92)
	2 × 2N7002K 60V 300mA N-channel Mosfet (SOT-23)
	10 × PMV25ENEAR 30V 5.5A N-channel Mosfet (SOT-23)

SMD Capacitors

	1 × 10µF 16V M3216/1206 X7R
	1 × 1µF 50V M2012/0805 X7R
	4 × 100nF 50V M2012/0805 X7R
	3 × 10nF 50V M2012/0805 X7R

SMD Resistors

	5 × 18kΩ ±1% M2012/0805 ⅛W
	2 × 4.7kΩ ±1% M2012/0805 ⅛W
	1 × 1kΩ ±1% M2012/0805 ⅛W
	2 × 820Ω ±1% M2012/0805 ⅛W
	2 × 470Ω ±1% M2012/0805 ⅛W
	2 × 270Ω ±1% M2012/0805 ⅛W
	4 × 220Ω ±1% M2012/0805 ⅛W
	2 × 180Ω ±1% M2012/0805 ⅛W
	4 × 100Ω ±1% M2012/0805 ⅛W
	2 × 68Ω ±1% M2012/0805 ⅛W
	8 × 56Ω ±1% M2012/0805 ⅛W
	1 × 33Ω ±1% M2012/0805 ⅛W
	1 × 18Ω ±1% M2012/0805 ⅛W
	1 × 12Ω ±1% M2012/0805 ⅛W
	1 × 5.6Ω ±1% M2012/0805 ⅛W

Cable & Hardware

	2 × 3.2mm ID 5mm OD 10mm long plastic untapped spacer
	4 × 12mm metal M3 spacer
	4 × 8mm blackened metal panhead M3 screw
	4 × 6mm blackened metal panhead M3 screw
	4 × 3mm ID steel M3 flat washer
	2 × 16mm metal panhead M2 screw
	2 × M2 hex nut
	1 × Medium, white face knob

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