Tempo tap circuit  using IC-CD4011
Controls & Timers
This Tempo tap circuit will have an effect than Tap the rhythm circuit other because the whistle is giddy, which vividly than usual knock. You can also adjust the speed with 10-40 strokes per minute. Operation of the circuit, we will be divided into three main parts of the schedule, the frequency generator, the control and amplify signals. The timing is IC1a, IC1b is a device to build up the frequency. This frequency is determined by R1, R2, C1, C2 and VR1. VR1 will be controlled by frequency And the frequency will be set of Q1, which works to affect …
Multi voltage power supply circuit  using IC-78xx series
Power supply
This is Multi voltage power supply circuit  as electrical circuit to supply DC power positive and negative. It also has multiple power levels as well. The equipment it easy to buy and affordable. Operation of this circuit, when T1 was to convert the AC voltage from 220 volts down to 15 volts, and D1-D4 connected to circuit Direct Contact bridge rectifier . Will act as a rectifier AC DC Then C1, C2, C5 and C6 serve filtered flows smooth and then, through to the leg 1 (Vin) of IC1 and IC2. By IC1 (LM7812) acts Direct loans isolate pressure for …
Random number with led 1 digit
Digitals
This is a circuit diagram showing the random nature of LED 7 segment. In the diagram circuit IC1 – LM555, R1, R2 and C2 on the circuit a sensitive multi-Stable Brett Foster (Astable. multivibrator circuit) function generator signal square (Square Wave) and send the pin 3 of IC1. It can change the frequency by VR1. and often to the leg 14 of IC2, it acts as a circuit of dozens, the output of IC2- SN7490 sent to the input pin of the IC3 – SN7447. The IC3 serves to decode (code BCD) to drive the 7-Segment a common anode, in …
usb light for notebook
Lightings
      When more work constantly. Son and uncomfortable, symptoms need to sleep watching the ball. I tend to use the laptop in the bedroom with him, but it will turn the lights in the room will interfere with his son, not that close to sleep. So I thought about buying a small lamp. Plug the USB port or USB light for notebook. Which to look at the store costs about 8$, (USB 2.0 Notebook Light) which I think we should create your own. By the existing equipment to create easily offline. I see the old mouse is broken, but cords and …
Counter display with led 7 segment by IC CMOS
Meters & Detectors
This is the simple digital counter circuit, the IC application number 4029 from binary data, and then sent to the IC number 4513, a driver IC 7 Segment, to show off a digital number from 0 to 9. When entering into a pulse signal input pin 15 of IC1, it will signal to the output signal is Binary.Then send the output from the pin Q0, Q1, Q2, Q3, and the pin. 6, 11, 14 and 2 of IC1.Go to the input of IC2 No. 4513. Which is IC displayed by the decoder signal to the Binary LED display with a …