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Stereo audio amplifier 2x10W
Audio amplifier with TDA2005/TDA2004/. Power supply: 8-18V Output power: 2x10W /Ucc=14.4V and RL=2ohm/ Frequency band:
67.25 KB
HOBBY KIT
1001
2
pc
| 1+ | 8.30 BGN |
| 3+ | 7.65 BGN |
| 5+ | 7.10 BGN |
| 10+ | 6.65 BGN |
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Audio amplifier 20W
Audio amplifier, with two TDA2003 in bridge connection. Power supply: 8-18V Output power: 20W /Ucc=14.4V and RL=2ohm/ Frequency band:
55.24 KB
HOBBY KIT
1002
2
pc
| 1+ | 7.40 BGN |
| 3+ | 6.85 BGN |
| 5+ | 6.35 BGN |
| 10+ | 5.95 BGN |
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Car alarm system
Device based on CMOS technology. For 4 doors car. Output time: approx. 15 seconds Input time: approx. 15 seconds /doors only/ Alarm signal time: approx. 70 seconds In case of opening any door - alarm signal goes "on"
62.2 KB
HOBBY KIT
1005
3
pc
| 1+ | 5.00 BGN |
| 3+ | 4.56 BGN |
| 5+ | 4.19 BGN |
| 10+ | 3.88 BGN |
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Home alarm system with siren
Alarm system based on CMOS technology. Push button or a magnet and REED switch can be used as
69.88 KB
HOBBY KIT
1006
4
pc
| 1+ | 6.60 BGN |
| 3+ | 6.10 BGN |
| 5+ | 5.65 BGN |
| 10+ | 5.30 BGN |
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67.9 KB
HOBBY KIT
1007
0
pc
| 1+ | 5.90 BGN |
| 3+ | 5.40 BGN |
| 5+ | 5.00 BGN |
| 10+ | 4.67 BGN |
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49.22 KB
HOBBY KIT
1009
0
pc
| 1+ | 5.00 BGN |
| 3+ | 4.58 BGN |
| 5+ | 4.22 BGN |
| 10+ | 3.92 BGN |
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LED VU-meter (12 LEDs)
Single mode LED-graph with discrete components and 12 LEDs. Input level: 0.75V Power supply:
69.4 KB
HOBBY KIT
1010
2
pc
| 1+ | 8.70 BGN |
| 3+ | 8.00 BGN |
| 5+ | 7.45 BGN |
| 10+ | 6.95 BGN |
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Protection circuit for audio amplifie
Universal protection device for audio amplifiers: - delays about 5 seconds switching speakers on when power supply is turned on - switches speakers off immediately - switches speakers off if end power amplifier gets out of order Power supply:
71.68 KB
HOBBY KIT
1013
2
pc
| 1+ | 4.00 BGN |
| 3+ | 3.66 BGN |
| 5+ | 3.37 BGN |
| 10+ | 3.12 BGN |
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Emergency siren
This device is based on discrete components in three parts: clock-pulse generator, audio frequency generator and power amplifier. Power supply: 9-12V Speaker: 4-8
70.96 KB
HOBBY KIT
1017
8
pc
| 1+ | 4.70 BGN |
| 3+ | 4.30 BGN |
| 5+ | 3.96 BGN |
| 10+ | 3.67 BGN |
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US police siren
Device with discrete components in three parts: clock-pulse generator, audio frequency generator and power amplifier. Power supply: 9-12V Speaker: 4-8
70.59 KB
HOBBY KIT
1018
6
pc
| 1+ | 4.70 BGN |
| 3+ | 4.30 BGN |
| 5+ | 3.96 BGN |
| 10+ | 3.67 BGN |
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Italian police siren
Device with components in three parts: clock-pulse generator, audio frequency generator and power amplifier. Power supply: 9-12V Speaker: 4-8
74.23 KB
HOBBY KIT
1019
> 10
pc
| 1+ | 4.70 BGN |
| 3+ | 4.30 BGN |
| 5+ | 3.96 BGN |
| 10+ | 3.67 BGN |
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83.65 KB
HOBBY KIT
1020
4
pc
| 1+ | 6.60 BGN |
| 3+ | 6.10 BGN |
| 5+ | 5.65 BGN |
| 10+ | 5.30 BGN |
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5-channel sound regulator (Equalizer)
Multi-channel sound regulator close to professional but much more cheaper. Power supply:
72.78 KB
HOBBY KIT
1026
4
pc
| 1+ | 5.20 BGN |
| 3+ | 4.78 BGN |
| 5+ | 4.43 BGN |
| 10+ | 4.13 BGN |
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60.76 KB
HOBBY KIT
1027
2
pc
| 1+ | 4.70 BGN |
| 3+ | 4.30 BGN |
| 5+ | 3.97 BGN |
| 10+ | 3.68 BGN |
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Stereo mixer
Audio mix device, with four inputs from tape recorder, tuner, gramophone and microphone, also with a sound regulator for low/high audio frequencies and preamplifier. Voltage: 9-18V Recommended for kits 1032
60.85 KB
HOBBY KIT
1028
3
pc
| 1+ | 11.20 BGN |
| 3+ | 10.40 BGN |
| 5+ | 9.70 BGN |
| 10+ | 9.15 BGN |
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Uni-polar to bipolar voltage converter
Uni-polar to bipolar voltage converter. At input voltage of 24V, the output voltage is 12V. Converter can be used for kits 1028 and
59.38 KB
HOBBY KIT
1032
0
pc
| 1+ | 4.00 BGN |
| 3+ | 3.66 BGN |
| 5+ | 3.37 BGN |
| 10+ | 3.12 BGN |
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Power supply +/-12V/100mA
Power supply based on rectifier, filter and parametric regulator. Input Voltage: 2x12V It has been designed for devices with consumption less than 100mA and bipolar supply voltage /kits with catalogue numbers 1028 and
58.48 KB
HOBBY KIT
1033
5
pc
| 1+ | 4.80 BGN |
| 3+ | 4.38 BGN |
| 5+ | 4.03 BGN |
| 10+ | 3.73 BGN |
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Electronic melody door bell
Device based on LM555 - 2 frequency generator. The first tone when the button is push-on, the second- when released. Power supply: 9V Speaker: 4-8
71.63 KB
HOBBY KIT
1034
5
pc
| 1+ | 5.30 BGN |
| 3+ | 4.86 BGN |
| 5+ | 4.49 BGN |
| 10+ | 4.18 BGN |
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Microphone preamplifier
Transistor preamplifier with an electret microphone, connected at the input. Power supply:
60.16 KB
HOBBY KIT
1035
3
pc
| 1+ | 3.90 BGN |
| 3+ | 3.54 BGN |
| 5+ | 3.24 BGN |
| 10+ | 2.98 BGN |
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Four circuits for timing relays
Timing project is for timing delays up to 30 seconds. The difference between 4 modes is in timing
HOBBY KIT
1040
5
pc
| 1+ | 5.70 BGN |
| 3+ | 5.20 BGN |
| 5+ | 4.81 BGN |
| 10+ | 4.47 BGN |
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Ni-CD battery charger
Batteries charge current is fixed, about 1/10 of battery capacity /as example, NiCd battery with capacity 900 mAh should be charged for 14 hours with 90 mA/. Input voltage varies on the number of batteries charged /connected in
58.06 KB
HOBBY KIT
1050
4
pc
| 1+ | 2.70 BGN |
| 3+ | 2.44 BGN |
| 5+ | 2.22 BGN |
| 10+ | 2.04 BGN |
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Power supply unit 12V/3A rechargeable battery
Power supply based on LM317T. Trimmer potentiometer is used to control the output voltage /10-14V/. In case of use of a battery, the output voltage is set to 13.6V to allow for recharge of the battery. In case that the input voltage is cut, the battery is on. Power supply unit is suitable for alarm systems and other devices need continuous operation in case of power mains failure. This device can operate also without a battery. Input voltage: 22V Output voltage: 10-14V Output current:
54.15 KB
HOBBY KIT
1051
3
pc
| 1+ | 10.80 BGN |
| 3+ | 10.00 BGN |
| 5+ | 9.30 BGN |
| 10+ | 8.75 BGN |
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Electronic door bell
Door bell based on LS1240A. The frequency of the sound depends on R1 and C3. Diodes D1, D2 and condensers C1, C2 form a voltage multiplier, as IC needs 12V and home bell circuitry is usually 8V. AC input
53.83 KB
HOBBY KIT
1055
4
pc
| 1+ | 6.70 BGN |
| 3+ | 6.15 BGN |
| 5+ | 5.75 BGN |
| 10+ | 5.35 BGN |
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Melody door bell - 4 melodies
Ringer based on PIC12C509. Tunes recorded in the memory of the micro controller are played in a sequence for each pressing of the push button. Power suplly: max
56.94 KB
HOBBY KIT
1310
4
pc
| 1+ | 9.40 BGN |
| 3+ | 8.66 BGN |
| 5+ | 8.03 BGN |
| 10+ | 7.50 BGN |
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Time relay, 0-99 min
Time relay based on PIC12C508. One dual 7-segment indicator is employed for indication, showing the remaining time. Two push buttons are used for setting relay operation time /this relay has a normal open and a normal close contact/ B1 for the first and b2 for the second element of the 7-digit display. Power suplly:
88.71 KB
HOBBY KIT
1325
2
pc
| 1+ | 18.60 BGN |
| 3+ | 17.30 BGN |
| 5+ | 16.20 BGN |
| 10+ | 15.30 BGN |
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0700 18 880
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