I want to study how a 27.145MHz crystal controlled Oscillator/Transmitter from a radio controlled toy works. I think that the input is at the emitter and output is at the collector. The emitter voltage appears to be out of phase from the collector. What is the best way of preceeding with my course of study?
[best viewed in courier font]V+ ---+ 6VDC ** | | E * o | B * ED1702L (Philips 1702L) / | C * o ** | +-----+--[L1]--+------+-----+-------+ | | | | | | | [10K] [Xtal] | [30pF] [100pF] | | | /c | | [10nF] +--------+----| | +-----[L2]---Antenna | | \e | | | | | | | | | +-----+ | | | | | | [5K1] [100R] [50pF] | | | | Gnd---+-----+---------------------+-------+
L1 is 2.56 microHenrys. L2 is a set of windings to decrease the size of the antenna 24.75 windings 8mm diameter 4.5mm length. Xtal is set at 27.145MHz
Thankyou for your response.
Steven Cooke