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8 9
11
8 9
5
10
3
4
212
1
R410K
R14K7
R24K7
C122n
R322K
C210n
VR1100K C3
2u2
R6470
R5470
D2
IC1LM2917
D1
SW1sensor
2
C210n
8
3
1
4
7
5
6
IC1
R1100KC1
1u
15v
0v
FreqInput
VR147K
Over Frequency Indicator with flashing LEDTrip point >100Hz.
R2430
R368
R4150
8 9
2
C210n
8
3
1
4
7
5
6
IC1
R1100KC1
1u
15v
0v
FreqInput
Frequency switchPin 5 low when Fin> 1/(2 R1 x C2)In this example, switch frequency = 500Hz
R34K7
R44K7
R21K
Tachometer driven from points (sensor). Modification has beemade to enable the source to be pulsed DC instead of AC.Note this uses the 14pin version of the IC.
LM2917 EXAMPLE CIRCUITS
The following examples have been taken from the PDF datasheet.
There are 2 types: Frequency to voltage conversion Frequency detection
8 9
2
C222n
8
3
1 4
7
5 6
IC1LM
2917N-8
R1100K
R210K
C11u
12v
0v
Vout66Hz/V
ACInput
R3470
Basic Frequency to Voltage Converter.Will measure from around 10Hz to 700Hz.Input must be an AC signal.
D3
Frequency to Voltage conversion
Frequency Detection