Multi-channel signal generator circuit composed of upc1651

This article introduces a multi-channel signal generator circuit composed of upc1651. As shown in the figure, IC1 and C1 in the figure form a low-frequency oscillator of about 400HZ; IC2 and C3 form a high-frequency oscillator of about 37MHZ; the low-frequency signal output by C2 modulates the high-frequency signal. C4 and the antenna constitute the transmitting system. The harmonics of the high-frequency oscillator can be received on the third channel of the TV (or other channels) and display black and white bar signals. The output signals at point A and point B are used as detection signal sources for low frequency and image channels respectively. Replacing C3 with a quartz crystal can stabilize the oscillation frequency, as shown in the dotted line in the figure. If you use a pair of binding posts or sockets to connect C3, replace C3 with crystals respectively; select the frequency as 465KHZ, 10.7KHZ, 6.5KHZ, 4.43MHZ, 37MHZ, you can use it as an intermediate frequency signal source for radio recorders and televisions.