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Mains Hum Notch Filter short-form kit

This kit includes the PCB for the Notch Filter plus all onboard parts. It does not include the case or a power supply.

Six 47nF ±5% capacitors are included. Their values have not been checked but they came from the same sealed package and at least four of the six should be close in value. Trimpots are included rather than fixed resistors.

Photo shows the assembled PCB. See the link immediately below for a complete list of parts in the kit.

Cat No SC7598. Price: AUD $40.00 ¹

In stock:

yes (25 available). Estimated dispatch time: 1-3 days

Related to: Project: Mains Hum Notch Filter (February 2026)

Other items relevant to this project:

Kit parts list

	2 × 500kΩ mini top-adjust trimpot
	4 × 100kΩ top-adjust multi-turn trimpot
	2 × 1kΩ mini top-adjust trimpot
	4 × BR-500 DIL reed relay
	1 × Mains Hum Notch Filter PCB [01003261]

Connectors

	1 × PCB-mount DC barrel socket, 2.1mm ID
	2 × 14-pin DIL dual wipe IC socket (DIP-14)
	2 × 8-pin DIL dual wipe IC socket (DIP-8)
	2 × switched right-angle RCA socket (white)
	2 × switched right-angle RCA socket (red)

Semiconductors

	1 × Blue 5mm LED with diffused lens (25mm leads)
	1 × NE555P timer IC (DIP-8)
	1 × TL071CP single JFET-input op amp IC (DIP-8)
	2 × TL074CN quad JFET-input op amp IC (DIP-14)
	1 × 78L05 5V 100mA linear regulator (TO-92)
	1 × BC337-40 50V 0.8A NPN transistor (TO-92)
	1 × 1N4004 400V 1A diode (DO-41)
	3 × 1N4148 75V 200mA diode (DO-35)

Through-hole Capacitors

	1 × 470µF 16V low-ESR electrolytic capacitor
	5 × 100µF 16V low-ESR 105°C electrolytic
	2 × 10µF 50V electrolytic (2.5mm pitch)
	2 × 1µF 50V electrolytic
	2 × 220nF 100V MKT
	3 × 100nF 63/100V MKT
	6 × 47nF 63/100V MKT

Through-hole Resistors

	2 × 470kΩ ±1% ¼W
	1 × 390kΩ ±1% ¼W
	8 × 100kΩ ±1% ¼W
	4 × 22kΩ ±1% ¼W
	7 × 10kΩ ±1% ¼W
	1 × 4.7kΩ ±1% ¼W
	1 × 620Ω ±1% ¼W
	4 × 150Ω ±1% ¼W
	2 × 10Ω ±1% ¼W

Cable & Hardware

	2 × Small ferrite bead
	4 × 5mm blackened metal panhead M3 screw

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