Logic probe TTL / CMOS

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STD Logic probe TTL / CMOS

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License: GPL 3.0

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Update time： 2024-12-06 17:30:28

Creation time： 2022-11-23 19:22:51

Description

A version of the original 10A Logic Probe.
A very simple design utilizing LM339 voltage comparator and some resistors for voltage reference and sensing of low and hight levels.

2 LED incicators for LOW and High levels and 3rd LED for pulse inticator if there are fastergates that normally can not be detected.

There are 2 version of the PCB's, one for through hole utilizing 1/8W resistors for beginers bit hessitant soldering SMD components and SMD version that are more endeverous and wish to solder 0603 components and practice their surface soldering

STL files for case can be found at http://PCBhut.comt/Products/LogicProbe/index.html

A Microcontroller version can be found at http://PCBhut.com/Products/LogicProbe-2/index.html

Design Drawing

schematic diagram

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Logic Probe
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PCB

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Template
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Logic Probe SMD
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Logic Probe
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BOM

BOM download Purchase Parts

ID	Name	Designator	Quantity
1	LM339	U1	1
2	330R	R21	1
3	1M0	R18,R15,R13,R14	4
4	10M	R20	1
5	100k	R9,R8,R12,R17	4
6	10m	R19	1
7	220k	R16	1
8	8k2	R2,R1	2
9	18k	R3,R6	2
10	220	R5	1
11	4k7	R4	1
12	33r	R10	1
13	10k	R7	1
14	1k0	R11	1
15	33r	R23	1
16	12pf	C2	1
17	1n914	D2,D1	2
18	DIODE-1N4001	D3	1
19	1k0	R22	1
20	DPDT.SLIDE	SW2	1
21	BC547-B	Q2	1	C2844035
22	BC557-B	Q1	1	C358539
23	AMS1117	U2	1
24	47uf	C1,C3	2	C78759
25	_	SW1	1
26	HDR-1X4 / 2.54	LCD	1
27	LED 3MM	LED3,LED2,LED1	3
28	33	R.1	1
29	SOD-123FL_L2.7-W1.8-LS3.8-RD	D.2,D.1	2