hobiku

K155 Stereo Tone Control Unit

General-purpose stereo preamplifier based on the venerable MC4558. -2dB Gain. +/-12dB bass & treble boost/cut, channel balance control. 0.8% THD, -3dB flat from <20hz>50kHz. S/N 85dB. Requires +6Vdc to +15Vdc supply (not included). 10mA supply current.

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Spec sheet of 60/160

Complete AM radio on a PCB. Tuned radio frequency front-end, single chip RF amplifier & detector and two stages of amplification of the audio signal into a speaker. All components supplied. Coil prewound. Excellent for schools. Uses MK484 radio IC

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Picture of PCB

ISD25120 chip

Record as many messages as you can in this modern, non- volatile, combined audio processing & memory chip from Information Storage Devices (ISD25120). One button to START/PAUSE & a second button to RESET

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Picture of PCB

A proven & popular power amplifier building block for use in any audio project. Power output is dependent on the supply voltage and load resistance. Over 10W is typical for a 16V supply into a 2 ohm speaker. A 12V supply into a 4 ohm speaker will deliver around 4W. Small heatsink provided. In late 2000 the LM383 was discontinued but the TDA2002 is a direct replacement

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Picture of PCB

Movement IC Specs - page 1

Movement IC Specs - page 2

RE200B PIR Sensor used in Kit 30

Essential specs on RE200B sensor

CdS Cell Specification Sheet

Fresnel Lens Data Sheet

Circuit designed around a recently developed movement IC the KC778B. Circuit utilizes PIR detector and a light dependent resistor (LDR) to provide an optimized circuit that will detect motion up to 6 metres away. Operates on 9-12 VDC. Note that the PIR sensor & the PCB-mounted fresnel lens fit on the other side of the PCB; the solder side. This is to allow the unit to be mounted inside a container with the detecting lens poking out and the controls facing inside the box

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Picture of 240V PCB

Picture of 110V PCB

Kit contains Xenon Flashtube as found on aircraft, camera flash units, signal beacons and disco lights. Adjust to flash from 1 every three seconds to 3 flashes per second. CAUTION: Connects directly to mains power supply. Must be put in a suitable enclosed box before using. Two PCBs for different mains voltage

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Picture of PCB

Introduces the Optocoupler-triac MOC3021 and triac. Complete electrical isolation between input audio signal (low voltage circuit) and output light modulation (mains supply voltage levels) is achieved.

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Kit 7 3V FM Transmitter

Picture of PCB

The most powerful 'bug' available for its size, 3V supply and number of components. Guaranteed to transmit over 100 meters within buildings and to 500 meters in the open. Easily tunable in the FM band. Greater range at higher voltage and better aerial. For an excellent introduction to the theory of 'simple' 2 stage transmitters download FM Transmitter Theory 1.2MB

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