PS1240P02BT Driver

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STD PS1240P02BT Driver

License: Public Domain

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Update time： 2018-09-03 04:45:28

Creation time： 2018-08-26 23:48:21

Description

4.8 KHz 555 driver PWM for the PS1240P02BT Peizo with KSC1815 or BC337 Output. 3vrms after the amp transistor with 50% duty cycle. This is a single (and annoying) tone roughly 50Db at 10cm. This is part of the chirp circuit on the WMP sense circuit. The Emitter of the KSC1815 (or BC337) will be pulled to ground with the ATTiny85 Pin 3 with a second NPN BC547 on a 200-500 ms pulse when the threshold of the sense goes low. VCC is 6V. This circuit will be added to the WMP Version 4.2 (thus no PCB)

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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity	Mounted
1	TLC555CDR	U1	SOIC-8_150MIL	1	Yes	C6986
2	100KΩ	R1,R14	1206	2	Yes	C17900
3	1k	R2,R3,R4	1206	3	Yes	C1409
4	BC337-25	Q1	TO-92(TO-92-3)	1	Yes	C74768
5	10nF	C1	0805	1	Yes	C83170
6	1.5nF	C2	0805	1	Yes	C1717
7	PS1240P02CT3	BUZZER1	B-12*5.0	1	Yes	C76873
8	ATTINY85-20SU	U2	SOIC-8_208MIL	1	Yes	C89852
9	BC547B Tube	Q2	TO-92(TO-92-3)	1	Yes	C2092
10	4.7k	R5	1206	1	Yes
11	S8050	Q3	SOT-23(SOT-23-3)	1	Yes	C139514
12	100Ω	R6,R7,R12	1206	3	Yes	C25348
13	Probe 1	P1	HDR-1X1/2.54	1	Yes	C81276
14	Probe 2	P2	HDR-1X1/2.54	1	Yes	C81276
15	2N3904	Q4	TO-92(TO-92-3)	1	Yes	C118538
16	10k	R8	1206	1	Yes
17	LED-3MM Red	LED1	LED-3MM/2.54	1	Yes	C99772
18	LED-3MM Green	LED2	LED-3MM/2.54	1	Yes	C99772
19	220	R9,R10	1206	2	Yes
20	Header-Female	P3	HDR-1X2/2.54	1	Yes	C49661
21	RT9266GE	U3	SOT-23-6	1	Yes	C18576
22	4.7uH	L1	IND-606028	1	Yes	C32684
23	100uF	C3	CAP-D6.3XH5.5	1	Yes	C72475
24	100uF	C4	CAP-D8.0XH10.5	1	Yes	C72480
25	1N5819HW-7-F	D1	SOD-123	1	Yes	C82544
26	0.22Ω	R11	1206	1	Yes	C25336
27	1uF	C5,C6	1206	2	Yes	C1926
28	100nF	C7	1206	1	Yes	C1945
29	MMBF170LT1G	Q5	SOT-23	1	Yes	C28871
30	620KΩ	R13	1206	1	Yes	C17972