Simple two-tone electronic doorbell circuit principle

PESD1CAN electrostatic protection SOT23-3 24V two-way

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

The principle of the simple two-tone electronic doorbell circuit is shown in the figure. The feature is: when the visitor continuously presses the doorbell button for more than 2s, the doorbell emits a "beep" sound with a residual effect; if the doorbell button is continuously pressed more than 3 times, the doorbell will make a pleasant birding sound.
The circuit works as follows:
The two-tone electronic doorbell circuit is composed of a trigger control circuit and a doorbell generation circuit.
The trigger control circuit is composed of a doorbell button S, a resistor R1-R3, an electric wearer Cl-C3, a diode VD1-VD3, a six-gate integrated circuit ICl (Dl-D6), and an electronic switch integrated circuit lC3 (S1, S2).
The doorbell generation circuit is composed of a resistor R4-R6, a sound effect integrated circuit 1C2, a helium container C4, a transistor V, and a speaker BL.
When the doorbell button S is continuously pressed for more than 2s, the internal D4 of the wide IC1 will output a high level, and the high level is charged to C2 via R2. When C2 is charged to 1.5V, D5 outputs a low level, and D6 outputs a high level, so that The electronic switch S1 inside IC3 is turned on, IC2 is triggered to work, and the sound effect electric signal outputted by the 2-pin is amplified by V, and the BL is driven to emit a "beep" sound.
When the doorbell is continuously pressed more than 3 times, Dl inside ICl will output a high-level pulse, which is rectified by VD2 and then charges C3, then D2 outputs a low level, and D3 outputs a high level, so that IC3 is inside. When S2 is turned on, IC2 is triggered to work, and the sound effect electric signal output by the 2-pin is amplified by V, and the BL is driven to emit a pleasant bird song.
Component selection
Rl-R6 uses 1/4W metal film resistor or carbon film resistor.
Cl-C4 selects aluminum electrolytic capacitors with a withstand voltage greater than 6V.
VDl-VD3 selects 1N4148 type silicon switch diode for use.
V selects S9013 or C8050, 3DGl2 type silicon rectifier diodes.
ICl selects CD4069 type six non-gate integrated circuit; IC2 selects KD-156 type sound effect integrated circuit; lC3 selects CD4046 type analog switch integrated circuit.