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Here is an Operational amplifier based sine wave generator circuit , it is basically a wein bridge oscillator . Because of its simplicity and stability, one of the most commonly used audio frequency oscillator is wein-bridge. The wein bridge oscillator in which the weinbridge circuit is connected between the amplifier input and output terminals. The bridge has a series RC network in one arm and a parallel RC network in the adjoining arm. in the remaining arms of bridge, input resistor R1 and Feedback Resistor Rf is connected. Read More.....

OPERATIONAL AMPLIFIER OP-AMP OSCILLATOR ELECTRONIC CIRCUIT Timing capacitor (C1) produces several times constants which is used to allow large voltage swings on the input due to the LM101's large input voltage range. The R2 should be reduced and the C1 should be increased to keep from exceeding these ratings. The smaller polarized capacitors is still used by returning them to positive supply voltage instead of ground, even though C1 requires the large values.

ADVANCED TOUCH SENSITIVE BURGLAR ALARM CIRCUIT Now i am going to introduce you Touch sensitive security alarm. I hope as the name itself gives you a clear view about the circuit and its function. The circuit alarms whenever an unauthorised person trying to access your costlier materials. This circuit is portable, cheap, and effective. Keep the touch plate on your metal knob, door knob, gate...... Where you want to restrict the misuse. Note:- The Touch plate should be conducting. Other useful links:- Touch sensitive switch Working of NE555 as astable multivibrator

Now we are going to discuss a Simple Ni Cad Battery Charger circuit . The circuit is wired as a constant current source. It is made possible by using two bjt transistors, 2N2219 and 2N2222. The circuit posses very low internal resistance so the output current is comparatively large (upto 74mA). This battery charging circuit will automatically turned off when the battery is completely charged. Read More.....