Well Audio, I was reading some articles to understand the functioning.... "Oscillator Types: 1. VFO (Variable Frequency Oscillator) - An oscillator whose output frequency can be changed by adjusting a variable inductor or variable capacitor. 2. VCO (Voltage Controlled Oscillator) - An oscillator whose output frequency is controlled or changed by an application of external voltage. VCO uses varicap diode that changes the capacitance as different levels of voltage are applied. 3. PLL (Phase Locked Loop) - A circuit that synchronizes a frequency of VCO with a frequency of a reference oscillator by using a comparison of phase between the two signals. PLL takes a frequency of VCO, divides it into a lower frequency which can be compared with a stable reference oscillator. Then amplifiers are used to send an appropriate voltage back to the VCO to keep the desired frequency stable. 4. Crystal Oscillator - Oscillator that uses a crystal to generate a frequency." 1.Which one is preferred in which conditions.......(i.e. voice fm tx,stereo fm tx....)? 2. If I'm right the transmitter crkt is based on VCO....and u r saying it should be crystal oscillator??? Is this crkt going to give me nothing or is it worth trying? 3. as far as stereo encoder is concerned,the second one looks to me better,as it is using crystal...what do u say ? 4. Can I transmit voice with a stereo transmitter???...by grounding L???? I started this topic without any knowledge about transmitters...but it seems to me that I'm getting some.Thanx for you helping.