Maharashtra HSC Electronics Technology (Vocational) case studies
Maharashtra HSC Electronics Technology (Vocational) · Put your knowledge to work in context.
Maharashtra HSC Electronics Technology (Vocational) is a Class 12 vocational subject examined by the Maharashtra State Board of Secondary and Higher Secondary Education (MSBSHSE). It is taken within the HSC vocational stream, normally alongside language papers and other vocational subjects, and it is assessed in two halves: a written theory paper and a school-conducted practical, oral, project and internal assessment component. The Maharashtra HSC Electronics Technology (Vocational) case studies are 5 cases and about 2,958 words.
1The 12 V Bench Supply That Drops Out Under Load
A vocational lab group is building a 12 V regulated bench supply for a soldering-practice station. The transformer is rated 15–0–15 V, 1 A; a bridge rectifier feeds a 1000 µF filter capacitor, and the output goes to a 7812 regulator bolted to a small aluminium bracket.
528 words, about 3 min2Crossover Distortion and Thermal Runaway in a Class-B Amplifier
A student builds a 10 W class-B audio power amplifier for the school science exhibition. The output stage uses a complementary pair of 2N3055/MJ2955 transistors on a 100 mm × 75 mm heatsink, driven by a TIP31 driver.
573 words, about 3 min3Contact Bounce and False Counts on a Conveyor Counter
A workshop project counts parts on a conveyor using an IR reflective sensor whose output goes low when a part passes. The signal is fed to the clock input of a 74LS90 decade counter, and its BCD output drives a 74LS47 decoder with a common-anode 7-segment display through 330 Ω resistors.
622 words, about 3 min4Noisy LM35 Reading and a Relay That Resets the 8051
An AT89S52 board reads an LM35 temperature sensor through an ADC0804 and switches a 5 V relay when the temperature exceeds 60 °C. The LM35 output is 250 mV at 25 °C and reaches the ADC input through a 300 mm unshielded wire.
606 words, about 3 min5Cold Joints and a Discoloured Track on Hand-Soldered Controller Boards
A batch of 25 identical controller boards is hand-assembled in the school lab. Each board has an SOIC-8 op-amp, 0805 resistors and capacitors, a through-hole relay, and a 0.5 mm wide, 35 µm copper track carrying 1.2 A from the input connector to the relay.
629 words, about 3 min