Electronic Projects 7

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The newsletter describes how to construct your own 12V battery tester, the circuit uses a LM358 operational-amplifier as a voltage comparator. (VB062)

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Skill Level of Item:		(Book)
Product #		VB062
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Electronic projects 4

In this newsletter three circuits are explained: a 555 LED flasher, a running light effect using the 4017B and 555 micro chip and an electrodice. (VB054)

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10 – 99	$0.08
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Skill Level of Item:		(Book)
Product #		VB054
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Electronic projects 6

Two circuits are described in this newsletter: a sound switch and a zener diode regulated power supply. (VB058)

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10 – 99	$0.08
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Skill Level of Item:		(Book)
Product #		VB058
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Electronic projects 2

Two circuits are explained, the first one is a transistor flip-flop circuit with 2 flashing LED's and the second is a coorination test game that uses a thyristor to demonstrate circuit switching. (VB049)

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Skill Level of Item:		(Book)
Product #		VB049
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Electronic projects 3

Three circuits are explained, a 555 Timer, 555 Oscillator with Light Dependent Resistor (LDR) and a light/dark switch using a LDR and 555 IC. The working of a 555 IC is also discussed. (VB052)

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10 – 99	$0.08
100 +	$0.07

Skill Level of Item:		(Book)
Product #		VB052
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Electronic projects 5

In this circuit a LM358 IC is used to form two oscillators. The one has a low frequency (1Hz) while the other oscillators at a high frequency (1KHz). The low frequency socillator modules the high frequency to form a two tone siren. (VB056)

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10 – 99	$0.08
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Skill Level of Item:		(Book)
Product #		VB056
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Electronic projects 1

Use of breadboard to build 3 different circuits using LED's and flashing LED's:LED Tester, Flashing LED and 2 Flashing LED's. THe light Emitting Diode (LED) is discussed.(VB044)

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Skill Level of Item:		(Book)
Product #		VB044
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Electronics projects 9

A voltage regulator is built using a transistor and a zener diode. A multimeter is used to determine the voltage changes with different load resistors. (AA204)

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Skill Level of Item:		(Book)
Product #		AA204
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20 second voice recorder/playback module (A93010/A96010)

PLEASE NOTE: A96010 or A93010 is supplied depending on availability. Currently only A93010 is available and is the one that is been sold. A96010 is not currently available. The small size is because the IC is in Chip-on-board form. One button is pushed down to record the message. The electret microphone is on the board. The LED turns on during this time. The other button just has to be momentarily pressed to replay the message. A second momentary press during playback will stop the playback. Sampling rate is 4K. All you have to add is the speaker (not included) and 5V DC power (not included). The record play time is determined by the 52K resistor. If you change it to 89K you will get 30 seconds but at a reduced sampling rate. Operating current 25mA. Standby current 10 uA. Size: 34 x 23 x 11 mm. The module comes supplied as you see it in the photo.

OPTIONAL ITEMS (Not included):
2 x (BB089) connector cable to connect the voice recorder to a speaker and power source.
1 x (PB244) Speaker
1 x Battery holder that can hold either 4 x AAA or 4 x AA or 4 x C or 4 x D cells. See our battery holders.

(A96010 & A93010)

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1 – 9	$6.60
10 – 99	$5.95
100 – 999	$4.95
1000 +	$3.95

Skill Level of Item:		(Assembled and Tested)
Product #		A96010
Quantity Available:		121