electrical circuit boards in the nature of a 3 digit display counter; electrical circuit boards in the nature of a 4 digit presettable down display counter basic for connecting to liquid crystal displays or LCs; PIR movement detector; light alarm; serial temperature sensor; 1 W stereo amplifier; ultrasonic movement detector; electrical circuit boards in the nature of a 6 volt xenon tube for any electronic school project; sound activated tape recorder switch; electrical circuit boards in the nature of a 4 ½ digit LCD display counter; audio to light conversion modulator; fiber optics for voice transmission; 3 stage FM transmitter timer for the main 200/240V power supply; stereo VU meter; preamplifier; square wave oscillator; dual temperature meter; amplifier module; tape recorder switch for telephone; step up DC to DC converter; 25 watt hifi audio amplifier module; DC motor speed controller; 9V FM transmitter; 40 second message recorder with looping option; LCD temperature meter; 3V FM transmitter; two station intercom; 110V & 240V main powered strobe light; telephone transmitter; light dimmer; siren 9V, L3W + 3W stereo amplifier module; IR remote toggle switch; basic class amplifiers and AB amplifiers; 3 circuit-in-1 LDR circuits; telephone line switcher; multimode timer; continuity tester; PC data acquisition unit in the nature of central processing units; audio power amplifier; 3 ½ digit panel meter; electric relays in the nature of a relay board or 2x1A miniature relays; timer; electrical circuit boards in the nature of a PIC flasher; electrical relay board in the nature of a PC driven relay board for an Integrated Circuit ("IC"); movement detector circuit module; main power relay switch; 8-bit data logger for use as simple flow frequency digital scope to examine audio and other signals up to about 5KHz; electrical 4 digit display timer module; electronic circuit board in the nature of a dual hi/lo switched relay board for a dual switch kit with high or low input; electrical circuit boards in the nature of a 5 bright LED flasher for random or in sequence flash patterns; 3-in-1 timer; electrical circuit boards in the nature of a PIR movement detector kit composed of sensors, detectors, a PCB mounted plastic lens, data on IC in the nature and sensor; one chip AM radio; multitimer; 120 second message recorder; infra red light barrier; electrical circuit board in the nature of a 4 servo motor driver; electrical circuit board in the nature of a unipolar stepper motor driver.