精密音频毫伏表电路 (Precision Audio Mil
精密音频毫伏表电路 (precision audio millivoltmeter)
measures 10mv to 50volt rms in eight ranges
simply connect to your avo-meter set @ 50΅a range
parts:
r1_____909k 1/2watt 1% metal oxide resistor
r2______90k9 1/2watt 1% metal oxide resistor
r3_______9k09 1/2watt 1% metal oxide resistor
r4_______1k01 1/2watt 1% metal oxide resistor
r5_____100k 1/4w resistor
r6_______2m2 1/4w resistor
r7______82k 1/4w resistor
r8______12k 1/4w resistor
r9_______1k2 1/4w resistor
r10______3k3 1/4w resistor
r11____200r 1/2w trimmer cermet
c1_____330nf 63v polyester capacitor
c2,c3__100΅f 25v electrolytic capacitor
c4_____220΅f 25v electrolytic capacitor
c5______33pf 63v polystyrene capacitor
c6_______2΅2 63v electrolytic capacitor
d1-d4___1n4148 75v 150ma diodes
ic1_____ca3140 op-amp
ic2_____ca3130 op-amp
sw1_____2 poles 5 ways rotary switch
sw2_____spdt switch
j1______rca audio input socket
j2,j3___4mm. output sockets
b1______9v pp3 battery
clip for pp3 battery
notes:
connect j2 and j3 to an avo-meter set @ 50΅a range
switching sw2 the four input ranges can be multiplied by 5
total fsd ranges are: 10mv, 50mv, 100mv, 500mv, 1v, 5v, 10v, 50v
set r11 to read 1v in the 1v range, with a sinewave input of 1v @ 1khz
compare the reading with that of another known precision millivoltmeter or with an oscilloscope
the oscilloscope reading must be a sinewave of 2.828v peak to peak amplitude
frequency response is flat in the 20hz-20khz range
if you have difficulties in finding resistor values for r1, r2, r3 & r4, you can use the following trick:
r1 = 10m + 1m in parallel
r2 = 1m + 100k in parallel
r3 = 100k + 10k in parallel
r4 = 1k2 + 6k8 in parallel
all resistors 1% tolerance
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measures 10mv to 50volt rms in eight ranges
simply connect to your avo-meter set @ 50΅a range
parts:
r1_____909k 1/2watt 1% metal oxide resistor
r2______90k9 1/2watt 1% metal oxide resistor
r3_______9k09 1/2watt 1% metal oxide resistor
r4_______1k01 1/2watt 1% metal oxide resistor
r5_____100k 1/4w resistor
r6_______2m2 1/4w resistor
r7______82k 1/4w resistor
r8______12k 1/4w resistor
r9_______1k2 1/4w resistor
r10______3k3 1/4w resistor
r11____200r 1/2w trimmer cermet
c1_____330nf 63v polyester capacitor
c2,c3__100΅f 25v electrolytic capacitor
c4_____220΅f 25v electrolytic capacitor
c5______33pf 63v polystyrene capacitor
c6_______2΅2 63v electrolytic capacitor
d1-d4___1n4148 75v 150ma diodes
ic1_____ca3140 op-amp
ic2_____ca3130 op-amp
sw1_____2 poles 5 ways rotary switch
sw2_____spdt switch
j1______rca audio input socket
j2,j3___4mm. output sockets
b1______9v pp3 battery
clip for pp3 battery
notes:
connect j2 and j3 to an avo-meter set @ 50΅a range
switching sw2 the four input ranges can be multiplied by 5
total fsd ranges are: 10mv, 50mv, 100mv, 500mv, 1v, 5v, 10v, 50v
set r11 to read 1v in the 1v range, with a sinewave input of 1v @ 1khz
compare the reading with that of another known precision millivoltmeter or with an oscilloscope
the oscilloscope reading must be a sinewave of 2.828v peak to peak amplitude
frequency response is flat in the 20hz-20khz range
if you have difficulties in finding resistor values for r1, r2, r3 & r4, you can use the following trick:
r1 = 10m + 1m in parallel
r2 = 1m + 100k in parallel
r3 = 100k + 10k in parallel
r4 = 1k2 + 6k8 in parallel
all resistors 1% tolerance
连接器的介绍 连接器的定义、标准
上海ABB机器人新工厂将于2021年投入运营
需要了解的Linux系统设备树
BriefCam发布基于边缘的计算AXIS摄像机应用平台——ACAP
美的遥控电风扇不能关机的维修电路
精密音频毫伏表电路 (Precision Audio Mil
蓝思科技发布佳绩预告 多项举措推动增长势头
如何才能做到智慧安全用电，一起来看看
经纬恒润升级为AUTOSAR高级合作伙伴 哈曼推出边缘计算软件平台
标新立异价出售AgilentN5245A网络分析仪N5245A
湖北电信完成各项智慧家庭产品发展任务
加快产品开发的正确途径
英特尔重返存储器市场推出新一代存储器半导体
人工智能其实不算是一个新的话题
世纪华与通咪咕公司5G云游戏生态建设等方面签署合作协议
酒店行业可以应用上区块链技术吗
虚拟现实正一步步向我们走来
合工大研发出一种基于单p-型硅肖特基结的超灵敏近红外窄带光电探测器
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