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Audible Logic Probe using 555 Manufacturer,Supplier and Exporter in India

Product Code : SCL-EELE-12735

Indian Lab Suppliers supplies the Audible Logic Probe using 555 (Product ID: 12735) as part of its electronics engineering lab equipment range. It shows how a 555 timer and a comparator IC make an audible logic probe that signals logic states by tone.

Quick Answer

When the probe tip senses a logic high the speaker gives a high-pitched tone, a logic low gives a low tone, and a pulse train produces a warbling high-low tone. A selector switch sets the thresholds for TTL or CMOS circuits. The board has 5 V and 12 V DC (100 mA) regulated supplies, a 0–12 V DC, 20 mA continuously variable supply, a quad comparator IC, a timer IC, an 8 Ω speaker and a 3½-digit digital panel meter for DC voltage. It runs from 230 V ±10%, 50 Hz mains.

Key Specifications

Parameter	Detail
Experiment	Construction and operation of an audible logic probe (TTL and CMOS)
Fixed supplies	5 V and 12 V DC, 100 mA, IC regulated
Variable supply	0–12 V DC, 20 mA
Digital panel meter	0–19.99 V DC, 10 mV resolution, ±0.2% ±1 digit, 10 MΩ input
Display	3½-digit, 12.5 mm 7-segment LED, auto polarity, overload indication
ICs	555 timer, quad comparator
Output	8 Ω speaker
Mains	230 V ±10%, 50 Hz AC

Where This Is Used

Used in digital labs and workshops for fault-finding practice; related boards include the Characteristics of CMOS IC (Product ID: 12739) and the TTL and CMOS Characteristic Trainer (Product ID: 12760). Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.