LF351 | Electronic Project Circuits

Posts Tagged ‘LF351’

Control signal Automatic Fader by LF351

This be Control signal Automatic Fader circuit , help fine decorate or control sound signal tallly or low follow want. In model the automatic convenient for the system electricity guitar , side sound of music work. By this circuit uses FET , then have tall rapidity , there is the crazy low and use IC op-amp model FET , number LF351. Then have disturb lower. The S1 for fine the pitch High or Low get, and have fining decorates the pitch done to a turn VR1,VR2 you can the detail adds in the circuit.

Be the first to comment - What do you think? Posted by admin - March 9, 2009 at 9:26 am

Categories: Electronic Control, Switching power supply Tags: audio control, audio fader, LF351

Sine Wave Generator with Bridge oscillator by LF351

Here is Circuit classic Wien Bridge oscillator using an Op-Amp covering a frequency range of 15 to 150kHz in four switched steps.

Two conditions exist for a sinusoidal oscillator. Regenerative or positive feedback, and a closed loop gain of unity. The losses in the wien feedback circuit, are such that the open loop gain of the amplifier must also exceed 29.

In this circuit the gain is provided by a FET type op-amp. I have used an LF351, which may be hard to obtain, but the TL071CN or TL081CN may be used and have a faster slewing rate than the LF351. The Maplin order codes are RA67X and RA70M respectively. The wien network is a parallel combination of resistor and capacitor, in series with a serial R-C network. Regenerative feedback is applied from the op-amp output, to the serail R-C input and continues. Stabilization is required to prevent the otherwise uncontrolled oscillation from building up and becoming unstable.

Read More Source:http://www.zen22142.zen.co.uk/Circuits/Testgear/sinegen.htm
Thank you.

Be the first to comment - What do you think? Posted by admin - February 9, 2008 at 9:45 am

Categories: Oscillator generator Tags: LF351, Oscillator generator, sine wave generator

6 Input Mixer by IC 741 , LF351 ,TL071

Description:
A simple mixer with 3 line inputs and 3 mic inputs using commonly available parts.

Notes:
The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor. As with any mixer circuit, a slight loss is always introduced. The final summing amplifier has a gain of 2 or 6dB to overcome this. The Input line level should be around 200mV RMS. The mic inputs are amplified about 100 times or by 40dB, the total gain with the mixer is 46dB. The mic input is designed for microphones with outputs of about 2mV RMS at 1 meter. Most microphones meet this standard.

The choice of op-amp is not critical in this circuit. Bipolar, FET input or MOS type op-amps can therefore be used; i.e 741, LF351, TL061, TL071, CA3140 etc.

Source :: http://www.zen22142.zen.co.uk/Circuits/Audio/6ipmix.htm