Free electronic circuit design and schematic diagram
This transformer-rectifier-filter arrangement gives you multiple output voltages with a single transformer. This AC-DC converter can be your solution is you need two level of symmetric power supply. Here is the schematic diagram of the circuit: U1 and -U1 uses a basic symmetric supply configuration, with a center-tapped transformer and full bridge rectifier for. U2 and -U2 uses a voltage […]
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The following circuit diagram show us another kind of CMOS oscillator. It’s will always oscillate because its a loop of three inverters. It would oscillate at a very high frequency (MHz) without the RC components depending on the propagation delays of the inverters. The RC branches give a phase shift of 60′ at some frequency, so the overall phase shift […]
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Below is a relaxation oscillator circuit using a 74HC14, an inverter with a Schmitt trigger input. It’s mean that the transition point for an increasing input is higher in voltage than the transition point for a decreasing input. The difference is called the “hysteresis.” Such an input is very useful for a slowly-varying inout or one with noise. The opposite […]
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Below is a circuit that demonstrates one use of an OTA using an LM13600. Take a note that the strange symbol stand for OTA. In this circuit, negative feedback is employed which is low-pass filter whose corner frequency can be electrically adjusted. We can a filter that would tune from 2700 Hz to 9000 Hz approximately for the values shown. […]
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A varactor is also known as a varicap or a variable capacitance diode. An electrically controllable capacitance is provided by this varactor which can be used in tuned circuits. What makes it’s advantageous in many application are the small size and inexpensive. If compared to a manually controlled variable capacitor, this varactor has disadvantages such as lower Q, nonlinearity, lower […]
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This voltage to frequency converter (VFC) circuit uses 555 IC and 741 op-amp as the main components. Up to 20kHz oscillation can be produced by this circuit. Here is the schematic diagram: The zero adjustment is used to adjust the lowest frequency, short the input to ground and adjust this pot to obtain the lowest frequency limit. This circuit uses […]
Read moreBelow is video tutorial about how to assemble the crossover network for the TriTrix speaker system. The TriTrix speaker system uses a second order crossover. Second order mean thare are two part coil for each filter. To assemble this, we only need a glue gun, plan board, wire and the electrics components. To assemble it, we can use a plain […]
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