Konstantin Repnikov

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J j

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Elfnt

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YURY ABUKHOUSKI

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Jul 25,2020

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High-speed protection for headphones

2 Layers PCB 37.1 x 99.6 mm FR-4, 1.6 mm, 1, HASL with lead, Red Solder Mask, White silkscreen

Contains a power-on module for the amplifier when connecting headphones

1847

9.63 (2)

Published: Jul 25,2020

Under the Attribution-NonCommercial-ShareAlike (CC BY-NC-SA) License.

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Topic

DIY Electronics

Audio

Music

headphones protection power LM339 G5V-2 Audio Jack G5LE-1

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Elfnt
On the printed circuit board, pin 2 and pin 3 of 79L12 are confused, parallel to the relay windings, it is necessary to put a diode from self-induction, instead of one of the jumpers, I soldered a 22uF 35V capacitor, which gave a delay for switching on relay K2 for 1 second (optional), with respect, Igor.

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Dec 14,20201 Comments
Konstantin Repnikov 2020-12-17 04:30:36Reply
Sorry, yes there was a mistake on the PCB, now everything is fixed. By default, the delay is about 3 seconds. The diode is not needed, the transistor has its own.
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	LM339	x 1
	G5V-2 24v	x 1
	BZX84C4V7	x 4
	BZX84C15V	x 2
	BZX84C6V2	x 1
	1N4148	x 1
	0805 100K	x 2
	0805 10K	x 2
	0805 470R	x 1
	0805 160K	x 2
	0805 820K	x 1
	0805 820R	x 1
	0805 10R	x 4
	BP 10uf 16v D5.0mm	x 2
	100uf 16v D6.3mm	x 3
	22uf 25v D5.0mm	x 3
	MMBF170	x 2
	78L12	x 1
	79L12	x 1
	TerminalBlock Phoenix PT-1,5-2-3.5 1x02 P3.50mm	x 7
	TerminalBlock Phoenix PT-1,5-2-5.0 1x02 P5.00mm	x 2
	Audio Jack 6.35mm	x 1
	G5LE-1 5-24v	x 1

LM339

G5V-2 24v

BZX84C4V7

BZX84C15V

BZX84C6V2

1N4148

0805 100K

0805 10K

0805 470R

0805 160K

0805 820K

0805 820R

0805 10R

BP 10uf 16v D5.0mm

100uf 16v D6.3mm

22uf 25v D5.0mm

MMBF170

78L12

79L12

TerminalBlock Phoenix PT-1,5-2-3.5 1x02 P3.50mm

TerminalBlock Phoenix PT-1,5-2-5.0 1x02 P5.00mm

Audio Jack 6.35mm

G5LE-1 5-24v

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