Circuit Diagram

REINARTZ_OSCILLATOR

Published:2009/6/23 2:09:00 Author:May

This oscillator uses mauctivity coupled emitter and collector windings to its main tank circuit.Take care so that L1 and L2 are not coupled to each other, otherwise this circuit is susceptible to parasitic at other frequencies.Typically ,L1 has 5 to 10 times the number of turns that L2 has.L1，L2，L3 are woundon same coil form. This oscillator is more suited to lower frequencies，≤10 MHz.   (View)

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PSEUDO_RANDOM_BIT_SEQUENCE_GENERATOR

Published:2009/6/23 2:09:00 Author:May

In this circuit, an additional exclusive-OR gate is connected after the modulo-2 feedback, with C1 and R2 applying the supply turn-on ramp into the feedback loop. This provides sufficient transient signal so that the PRBS generator can self-start a power-up. A shift-register length n of 10 is shown with feedback at stages 3 and 10, providing true and inverted maximal length sequence outputs. This technique applies an input directly to the feedback loop. Therefore, it's considered more reliable than applying an RC configuratior) to the shift-register reset input to create a random turnon state.   (View)

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PROGRAMMABLE_GAIN_NONINVERTINGAMPLIFIER_WITH_SELECTABLE_INPUTS

Published:2009/6/23 2:08:00 Author:May

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AM_OSCILLATOR_FOR_WIRELESS_MICROPHONES

Published:2009/6/23 2:05:00 Author:May

This circuit will generate an AM-modulated signal in the AM broadcast band that can be picked up on a receiver.About 2V of audio input will produce about 30% modulation of the oscillator signal.An old AM broadcast oscillator coil or other two-winding coil with about a 10:1 turn ratio and about 50 to 150 μH inductance can be used for T1.   (View)

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PRECISION_PROCESS_CONTROL_INTERFACE

Published:2009/6/23 2:03:00 Author:May

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HF_VFO_CIRCUIT

Published:2009/6/23 2:22:00 Author:Jessie

This typical HF VFO circuit has several stability-enhancing features, including well-chosen capacitor types. The frequency of the VFO is approximately 2π (C1 + C2 + C3) L1. L1 should be an aircore type coil, rigidly mounted, with high (>200 value) value of Q.   (View)

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1_dB_PAD

Published:2009/6/23 2:03:00 Author:May

The 1-dB pad is useful as a termination in RF work to limit possible mismatch range between system blocks, etc.   (View)

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DISCRETE_CURRENT_BOOSTER

Published:2009/6/23 2:02:00 Author:May

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CAPACITOR_HYSTERESIS_COMPENSATOR

Published:2009/6/23 2:22:00 Author:Jessie

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JFET_VARIABLE_FREQUENCY_OSCILLATOR

Published:2009/6/23 2:01:00 Author:May

This simple JFET-based variable-frequency oscillator can be used in receiver and transmitter circuits.   (View)

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COMPLEMENTARY_OR_BILATERAL_ac_EMITTER_FOLLOWER_CIRCUIT

Published:2009/6/23 2:20:00 Author:Jessie

This noninverting circuit uses a pair of com-plementary npn (2N3904) and pnp (2N3906) transistors.   (View)

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GROUNDED_BASE_TUNED_COLLECTOR_OSCILLATOR_FOR_AM_BROADCAST_BAND

Published:2009/6/23 2:20:00 Author:Jessie

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OCTAL_D_A_CONVERTER

Published:2009/6/23 2:00:00 Author:May

This octal digital-to-analog converter operates on 5V and provides eight output voltages, each digitally adjustable from supply rail to supply rail (0 to 5V). Each output's resolution is 20 mV/LSB. The DAC chip (IC1) requires 3.5V of headroom between its VDD and reference voltages. However, a voltage-doubler charge pump (IC2) removes this limitation by generating an approximate 10-V supply for VDD. All of the converter references are connected to the 5-V supply. IC2 doubles the 5-V input to an unregulated 10-V output that has an output impedance of less than 10Ω. It can deliver 100 rnA, which enables the eight DACs to issue their maximum output currents simultaneously (8×5 mA = 40 mA).   (View)

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FREQUENCY_MODULATED_OSCILLATOR

Published:2009/6/23 2:00:00 Author:May

This circuit can be used for FM wireless audio, microphone, and part-15 applications where a stable frequency modulated oscillator is needed. LT can be varied to cover 75 to 150 MHz, as needed.   (View)

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LOGARITHMIC_AMPLIFIER

Published:2009/6/23 1:59:00 Author:May

Unusual frequency compensation gives this logarithmic converter a 100 μs time constant from 1 mA down to 100 μA, increasing from 200 μs to 200 ms from 10 nA to 10 pA. Optional bias current compensation can give 10 pA resolution from - 55 ℃ to 100 ℃, Scale factor is 1 V/decade and temperature compensated.   (View)

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COLPITTS_OSCILLATOR

Published:2009/6/23 1:58:00 Author:May

Here: L1≈7μH/f, C1≈C2≈C3≈2400pF/f, where.f is in MHz. In this circuit, the oscillator is free-running.   (View)

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DDS_DIGITAL_VFO

Published:2009/6/23 1:58:00 Author:May

The DDS chip (U1) generates a data stream that is converted by D/A converter U2 into a sine wave. U1 is programmed via the input from P1, from the LPT port of an IBM PC. The system uses a 40-MHz TTL output clock module.   (View)

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CRYSTAL_OSCILLATOR_Ⅲ_

Published:2009/6/23 1:58:00 Author:May

These circuits are for use with a crystal-controlled LO usmg the NE602 C1，C2，and C3 arefor crystals in the 5-MHz region and are approx⒈mately chosen from C3 is for fine tuning the crystal frequency and will be 20 to 50 pF typically．   (View)

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TRIAC_LAMP_DIMMER_CIRCUIT

Published:2009/6/23 1:58:00 Author:May

The brightness of a lamp or lamps can be varied with this circuit. The snubber circuit values are typically 0.1 μF and 100-Ω.R8, is typically 25 to 100 kQ.   (View)

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POWER_BOOSTER

Published:2009/6/23 1:57:00 Author:May

Power booster is capable of driving mod-erate loads. The circuit as shown uses a NE5535 device. Other amplifiers may be sub-stituted only if R1 values are changed because of the ICC current required by the amplifier. R1 should be calculated from the following ex-pression:   (View)

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