STEP Skills Development and Competitions CONTEST AREA: Industrial Arts CONTEST PACKAGE 20-Watt Amplifier
YEAR LEVEL: All Year Levels
ASSESSMENT CRITERIA
Contestant/s
T PERCENTAGE
40%
Functionality
b. Submission of required documents for the contest.
4 hours
d. Briefing orientation of trainers with the contest administrator a
35%
Workmanship
day before the actual competition. e. Inspection and distribution of contest materials.
Organizer/s
a. 30w soldering iron with stand
PRELIMINARY ACTIVITIES
c. Ocular inspection of the contest venue.
DESCRIPTION
RESOURCES
PROCEDURE/SPECIFICATIONS
a. Contest registration of trainers and contestants.
TIME ALLOTMENT
Number of Participants: 1
T O O L S
b. long nose pliers c. diagonal cutter d. flat screw driver e. philips screw driver f. g. h. i.
electric drill reamer desoldering tool PCB holder
T
This contest piece is a low cost 20w Amplifier with Tone Control and Safety Microphone Mixer consisting of three circuits: the audio power amplifier, tone control and microphone mixer circuits mounted in a pre-board aluminum casing. Time The labels of the front and rear panels Management are designed from a computer and pronted in a piece of folder paper and is covered with a 2 1/4 inch scotch tape.
ILLUSTRATION
DURING 10%
administrator (10 minutes). b. Final instructions of trainers to their contestants (5 minutes). c. Inspection of contest materials, tools, and equipment.
10%
It can be used as sound system for cars or home. MP3 and CD players can be connected to its input and a microphone for sound mixing as in a videoke system. It can also be used as a sound system inside a classroom.
d. Other instructions (i.e. coaches)
a. Trainers shall serve as judges.
Communication Skills
5%
b.
All outputs shall be endorsed to the Secretariat by the Contest Administrator.
c. All endorsed outputs shall be displayed until the duration of the
skills com competition petition..
NOTES TOTAL
100%
ATTACHMENT(S) Analytic Scoring Rubrics/ Percentage Table/ Contact no. of PCB Supplier
FORM OF JUDGING Compatriot Judging
a. With regard to the provision of resources, the division and
regional organizers may opt to deviate. b. Coaches are allowed to observe the process within 3 meter
range. c. All diagrams shall be provided by the organizers.
a. Volt-Ohm Milliammeter (VOM)
3-Ampere Regulated Power Supply
a. Front and rear labels b. elmer's glue c. 1 roll 2-1/4" scotch tape
AFTER
Schematic Diagram, PCB Design with Components' Layout, Parts List of Kits EMPLOYABILITY OR BUSINESS OPPORTUNITY Sound System and BGM Installer
USE
a. Briefing of trainers and contestants with the contest
E Q U I P M E N T
M A T E R I A L S
d.
2 pairs alligator clips
a. 1 set 20W audio amplifier kit
with tone control and microphone mixer b. 4"X1-3/4"X8-5/8" aluminum
chassis c. 1 set 50W speaker system
PERFORMANCE SCORING RUBRICS FOR 20-WATT AMPLIFIER CRITERIA
A. FUNCTIONALITY
40%
B. WORKMANSHIP 35% Mounting and Placement of Components 10%
Soldering
10%
Circuit Wiring
10%
Mounting of Front and Rear Panels 5%
C. SAFETY WORK HABITS
10%
95 • Very clear sound, no hum, no distortion heard from the loudspeaker using MP3/MP4 player and microphone as line inputs for audio mixing with the volume control set at 50% and 70% volume ratio. • All components were properly mounted on PCB based on proper mounting of electric component*
PERFORMANCE LEVEL 90 85 • Normal sound output with • Normal sound output with minimum hum heard from the audible hum heard from the loudspeaker with or without loudspeaker with or without distortion. distortion.
80 • Weak sound output with or without hum or distortion.
• Less than 10% of components were not properly mounted
• 10% or more but less than 20% of components were not properly mounted
• 20% or more but less than 30% of components were not properly mounted
• All components and joints were properly soldered (no cold solder joints)
• Less than 10% of components and/or joints were not properly soldered
• Connecting wires were neatly laid out.
• One to three wires were damaged; connecting wires were neatly laid out.
• 10% or more but less than 15% of components and/or joints were not properly soldered • Four to six wires were damaged; connecting wires were neatly laid out
• 15% or more but less than 20% of components and/or joints were not properly soldered • Seven or more wires were damaged; connecting wires not neatly laid out
5
4
3
2
• Both front and rear panels were properly and accurately mounted without evidence of bubbles and scratch on the surface. • Work area was well kept. Tools and materials were properly arranged. No tool was damaged. No injury.
• Both front and rear panels were properly and accurately mounted but with presence of bubble/s and/or scratch on the surface.
• One of the panels was not properly mounted with evidence of bubble/s and/or scratch on the surface.
• Both panels were not properly mounted with the presence of bubble/s and or scratch in either front/rear panel
• Work area was partially kept. Some tools and materials were not properly arranged. One tool was damaged. No injury.
• Work area was adequately kept. Almost all tools and materials were not properly arranged. Two or more tools were damaged. No injury
• Tools and materials were left out in messy situation. Work area was left unclean. With minor injury (no presence of blood)
D. TIME MANAGEMENT
10%
E. COMMUNICATION SKILLS (3-5 minutes only)
5%
95 • The contestant was able to finish the output within three (3) hours or less • Able to clearly discuss/explain with confidence all of the following: a. process b. function of tools, materials and equipment c. cost of production d. employability e. business opportunity
90 • The contestant was able to finish the output within three (3) hours and 15 minutes. • Able to clearly discuss/explain with confidence 4 of the following: a. process b. function of tools, materials and equipment c. cost of production d. employability e. business opportunity
85 • The contestant was able to finish the output within three (3) hours and 30 minutes. • Able to clearly discuss/explain with confidence 3 of the following: a. process b. function of tools, materials and equipment c. cost of production d. employability e. business opportunity
80 • The contestant was able to finish the output within three (3) hours and 45 minutes. • Able to clearly discuss/explain with confidence 2 of the following: a. process b. function of tools, materials and equipment c. cost of production d. employability e. business opportunity
Front Panel of the Contest Piece MIC 1 Control VOLUME
BASS
MIC 2 Control
TREBLE MIC 1
MIC 2
POWER
20 WATTS AMPLIFIER WITH TONE CONTROLS AND AUDIO MIXER
STUDENT TECHNOLOGISTS AND ENTREPRENEURS OF THE PHILIPPINES
6-INPUT LINE MIXER
Parts List R1-R6 R7-R12 R13 R14 R15 R16 R17
= = = = = = =
22K 39K 100K 2.2K 6.8K 68? 1K
C1-C6 C7-C8
= =
10µF/16V 47µF/16V
Q1
=
C945
20 WATTS AUDIO AMPLIFIER
2-INPUT MICROPHONE AMPLIFIER
R1 - 47KΩ R2- 1MΩ R3- 1KΩ R4- 68Ω
R5- 4.7KΩ R6- 2.2MΩ R7- 22KΩ R8- 220Ω
C1- 10µF/16V C2- 47µF/16V C3- 47µF/16v C14- 47µF/16V
Q1 Q2
C945