Repository-circuits
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How to create a Battery pack for your Apple device that is powered by normal Alkaline batteries. This will be a general overview of building the circuit for the battery pack and the detailed instructions for the case will be given in part 2 of this post.....
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Making 90 degree phase shift on VHF. This IQ Oscillator is easy way with two logic IC`s. 74AC04 inverter is used as oscillate circuit. C5 and R6 is phase shifter. 74HC14 has a duty to convert into square-wave. It is usualy used 74HCU04 in crystal oscillator....
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Using LEDs as light sensors. A DDR pad. We designed our pad to have no moving parts. Instead, we chose to measure light reflectance off the user`s feet to determine if one of the arrows was being stepped on or not. Since a design with no moving parts offers....
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This very simple circuit uses a transformer, two diodes, a capacitor and an ammeter. To charge a battery just connect the + and terminals of the circuit to the corresponding terminals of the battery. When the battery is not charged, the ammeter reading shows....
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Here`s a nice little circuit diagram for all those hardcore DIYers if you are trying to build a dual fan controller using an ATtiny45 although I`d never use this thing, I`d rather use a CUBLOC. Over the course of a weekend, I cobbled together some leftover....
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The silicon photomultipliers (SiPM) we are using in our experiment were purchased from Photonique. Photonique also supplies analog electronics boards to amplify the signals from the SiPMs. This page discusses the analysis and modeling of the amplifier....
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The purpose of this digital electronics project is to record messages using a dedicated voice recorder integrated circuit. Recordings are stored in a non volatile memory cells, which means that the message will still be saved even though power has been....
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Video switcher circuit is needed to display more than one display in one monitor. Take a look at below circuit schematic : MAX454 is the core of this video. It is a video multiplexer-amplifier assembled by MAXIM Semiconductor. Pay attention when designing....
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This circuit must be connected before the amplifier circuit. For maximum performance, you may use high quality electronic component such as metalfilm resistor, MKM capacitor (nonpolar), tantalum capacitor (bipolar). You may replace the power supply module....
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This is the tuned radio frequency receiver for shortwave (25 meter band, 11. 7. 12. 1 MHz). It was created as experimental design for further experiments with the autodyne synchronous receiver (see Polyakov V. T. Autodyne synchronous regenerative receiver. -....
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The advantage of synchronous reception of AM signals is widely known. It includes high selectivity, linearity of detection and a low noise level at the output compared to other ways of reception. The circuit diagram is shown in figure 1. The operation of the....
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This circuit produces the power to drive a bipolar stepper motor. The rotation speed and the rotation direction of the stepper motor can be changed. This circuit consists of two integrator circuits (A1, A3) and the amplifier (A2) connected in series. This....
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By using the reverse binary counter and the binary-coded decimal decoder can obtained the step voltage, and by approximating this voltage can be produced the sine wave signal with sufficient accuracy, suitable for many purposes. In the circuit diagram of the....
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The schematic diagram shown in Figure 1 have the ability to synthesize a sinusoidal waveform with a frequency of 0. 01 Hz to 1 MHz. The clock signal feeds to the input of the binary counter IC1, this clock frequency is 32 times more than the output....
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The notion of "crystal radio" is strongly associated with huge antennas and radio broadcasting on long and medium bands, in this article, the author describes the experimentally tested detector circuits of VHF receivers designed to listening to a FM....
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This article describes some simple FM direct conversion radio receivers with phase-locked loop (PLL). This receivers uses the method of locking the local oscillator frequency with the input signal [1]. All this FM receivers are based on the circuit shown in....
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Measuring the radiation can be made not only with expensive factory-made instrument. The simplest device (see Figure 1), can be build if you have a counter (radiation detector) type SBM-20 or similar. The circuit is powered by a 220 volts AC 50/60Hz. The....
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A simple radio receiver circuit is shown in Fig. 1. This receiver is designed for reception of signals of amateur radio stations operating in the SW band of 10, 15, 20, 40 and 80 meters. This direct-conversion receiver consists of a set of an input bandpass....