lampu lilin elektronik

Meski sangat sederhana, lampu lilin elektronik ini sangat unik.

Karena lampu lilin ini dapat dipergunakan sebagai pengganti lilin biasa ketika sedang berulang tahun.
Sangat cocok bagi muda-mudi ataupun pasangan yang menginginkan kejutan dan suasana romantis bagi pasangannya.

Untuk menyalakannya kita hanya butuh menyalakan sebuah korek api, dengan catatan, penerangan ruangan sebelumnya harus dibuat agak redup.
Setelah LDR mendapat cahaya dari korek api, maka akan terjadi perubahan tahanan pada LDR. Sim salabim ...lampu menyala. Kejutan buat si dia.

Untuk mematikan kembali, kita dapat meniup LDR tersebut.

Jika anda dapat mengemas dalam bentuk yang cantik dan menarik, sangat memungkinkan menjadi komoditas yang menjanjikan.


Daftar Komponen :

Trimpot RV ………....….. 100 K
LDR……………………....... TIL-209
TRANSISTOR TR……… BC-108
Saklar Lampu…………… 3,1 V / 0,3 mA
Baterai…………………..... 3 buah

Skema Rangkaian Pengusir Tikus


Tikus memang menjengkelkan, apalagi ketika sudah merusak barang kesayangan kita,dan kotorannya yang baunya minta ampun. Dengan alat pengusir tikus elektronik ini dapat membantu anda untuk mengusirnya:

Skema Rangkaian Pengusir Tikus

Auto Switch-Off Torch


An elderly acquaintance who couldn't cope with battery recharging was getting through dry cells rapidly by leaving their torch switched on, so I built the following LED torch circuit which switches off automatically after about five minutes. Switching the torch off manually then resets the circuit.



Operation

On closing the switch G1 output goes high and the capacitor charges slowly through R2. The high output of G3 provides base current for Tr1 via R3. If the voltage dropped across R4 exceeds 0.6V Tr1 begins to conduct and robs Tr2 of base current, thus lowering the collector current of Tr2 and the R4 voltage. Tr1 and Tr2 hence provide an approximately 20mA constant current source for the LED. After about 5 minutes the capacitor voltage reaches the Schmitt threshold voltage and gates G2, G3 and G4 change state. The now low output from G3 switches off Tr2 and hence the LED. If the switch is then opened G1 discharges the capacitor rapidly through the diode across R2, resetting the circuit.

Notes and Modifications

The value of R1 is not critical (anything ~1 meg or more will do, and higher values will give greater protection against static damage to G1 if the battery terminals are touched).
Tr1 and Tr2 are any general-purpose npn transistors, e.g. 2N2222, 2N3904.
By removing Tr1, R4 and the LED and connecting Tr2 emitter directly to ground the circuit could be used to switch other loads. R3 might then need to be reduced in value.

Rangkaian Lampu LED

Rangkaian Lampu LED Sepeda Motor ini sangat sederhana yang hanya menggunakan beberapa komponen saja tapi hasilnya sangat memuaskan. Konsumsi dayanya sangat kecil cukup 6 Volt saja sangat  cocok untuk sepeda motor anda.
The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time intervals for the two lamps are about 107 milliseconds (T1, upper LEDs) and 104 milliseconds (T2 lower LEDs). Two transistors are used to provide additional current beyond the 200 mA limit of the 555 timer. A single LED is placed in series with the base of the PNP transistor so that the lower 20 LEDs turn off when the 555 output goes high during the T1 time interval. The high output level of the 555 timer is 1.7 volts less than the supply voltage.

Circuit  Project: 40 LED Bicycle Light

Adding the LED increases the forward voltage required for the PNP transistor to about 2.7 volts so that the 1.7 volt difference from supply to the output is insufficient to turn on the transistor. Each LED is supplied with about 20mA of current for a total of 220mA. The circuit should work with additional LEDs up to about 40 for each group, or 81 total. The circuit will also work with fewer LEDs so it could be assembled and tested with just 5 LEDs (two groups of two plus one) before adding the others.

Source: http://www.diyelectronicsprojects.com/

12 volt menggunakan 2n3055

rangkaian adaptor 12 volt 2N3055
Skema rangkaian adaptor 12 volt 2N3055
Rangkaian Adaptor 12 volt 2n3055

This adapter circuit can deliver up to 3A at 12V output voltage. The circuit can be employed on occasions when a current of more that 3A is demanded for regulator. IC regulators of such high current rating are pretty hard to find.

The transformer T1 steps down mains voltage, to 12rms & the rectifier bridge D1 rectifies it to produce a DC voltage. The C1 filters the rectifier output and produces a DC level. The series pass transistor Q1 (2N 3055) is biased by resistor R1 (680Ω). Since zener diode D1 is under breakdown region the voltage across it will be 12V. So the total output voltage will be steady 12.7 V(theoretically). That is the zener voltage plus base emitter voltage of Q1.Here transistor Q1 will conduct the excess current required .





Notes.
  • If 12V zener is not available ,use the nearest value.
  • The transformer T1 can be as 23oV primary;15V/5A secondary step down transformer.
  • The capacitors must be rated at least 25V.
  • By changing the value of the Zener diode, different output voltages can be obtained from the circuit.

The 2N3055 is a silicon Epitaxial-Base Planar NPN transistor mounted in Jedec TO-3 metal
case. It is intended for power switching circuits, series and shunt regulators, output stages and high fidelity amplifiers.

Maximum Ratings
  • Collector-Base Voltage 100 V
  • Collector-Emitter Voltage (RBE £ 100W) 70 V
  • Collector-Emitter Voltage (IB = 0) 60 V
  • Emitter-Base Voltage (IC = 0) 7 V
  • Collector Current 15 A
  • Base Current 7 A
  • Total Dissipation at Tc £ 25 oC 115 W
  • Storage Temperature -65 to 200 oC
  • Operating Junction Temperature 200 oC

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