Three Timer Circuits Timer circuits are handy for many experimenters�f laboratory functions, not to mention the photo or PC lab. This kit is another three-in-one in that all three circuits are complete and separate; simply using different types of circuits to do exactly the same job. All come complete with 5 amp relays for controlling pretty significant loads. All may be operated on battery or light weight (9V DC) supply. The advantages and disadvantages of each design are discussed in the text. Educational and useful too. No. 80-850 Three Timer Circuits YDI Price $39.90 ( If you need a truly precise, multi-mode timer circuit see no. 80-141; a very versatile unit.)
	Stereo VU Meter This is a very eye appealing audio accessory. Displays an approximate output level for each channel of stereo amplifier. Connects to the speaker terminals; levels are displayed in ten discrete steps. User may select a moving dot bar appearance. Uses two LM3915 IC�fs; includes a discussion of measuring audio power. No. 80-880 Stereo VU Meter kit YDI Price $24.90
	3 Watt Stereo Amplifier (Photo shows only the board, but components are included) The Rohm BA5406 IC is used to make this powerful little stereo amplifier. The entire circuit is on a 1-1/2" x 2-1/2" circuit board. You�fll need to allow added space of 1-1/2" x 1-1/2" x 2-1/2" for the heat sink, plus ventilation for same. In addition to a 12 VDC power supply (batteries), you will need to provide 4 or 8 ohm speakers, cables and a heat sink compound to put between the IC and the heat sink. No. 80-900 Three Watt Amp kit YDI Price $29.90
For Fun, C.O.B. Project Kits C.O.B. means "Chip on Board"; and most of the electronics is inside a tiny, application-specific chip,   (integrated circuit), on a PC board. These circuits are fun but won�ft be much of a challenge or education as they are so simple; you add a battery and the circuit is ready to go. No. 80-910 - Four Train Sound Effect. Ideal for model railroads; produces the whistle, train chugging sound, crossing bell and the �eclickety-clack of crossing a bridge. YDI Price $14.90 No. 80-920 - Cellular Phone Sound Effects. Good for a kids toy; imitates the cellular phone sounds perfectly. YDI Price $9.90 No. 80-930 - Assorted Melodies. Great for kids! Sixteen melodies such as: "Farmer in the Dell", "Hush Baby", "Home on the Range" and other familiar tunes. YDI Price $9.90 No. 80-940 - Ambulance, Fire and Police Sounds. Sirens and machine guns and more; great for kids toy! YDI Price $12.90 No. 80-950 - Happy Birthday on a Chip. A great item to hide in a package, plays happy birthday repeatedly. YDI Price $4.90
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