Frequency to Voltage Converter Circuit

Circuit today!  I would like to present the converter for convert frequency to voltage with IC the LM331  when you say to a frequency counter Needless, you have no use for, but for those who do not, you may still be able to LM331 in production since be found 1995th

Electronic Part List

R1, R3  1K 1/4W Resistor 
R2  5K Pot 
U1  LM339 Op Amp IC 
D1  1N5233B Zener Diode 
D2  LED 
BZ1  Piezo Buzzer

This Fact Sheet contains a linear accuracy of 0.06% to 10 KHz with the standard proposed timetable below minus air-conditioning circuit consists of the 741 I are acceptable both to the square and sine, designed the LM331 input form. Actually, with my DVM error of the best I could ever have been combined by type 1 and 1.5% linearity.

Frequency to Voltage Converter PCB

Frequency to Voltage Converter Assembly Part

 

The input comes from S1-5 or directly from the transistor channel output and the F and V output voltage directly read into the DVM 2VDC wide-range input for milivolt to 1999 kHz to Hz for or the next higher range of 20Vdc maximum 10KHz or 10VDC.

Diodes D1 and D2 and connect power from S1-1 and S1-2 and thus the voltage to the converter, if a generator is not on the off-voltage generator, a half voltage drop across the selected diode chosen the result. The diodes are not needed when only one generator. The diodes can also be removed when a 3PDT be used for S1.
To this maximum value of 10 V, a supply of 12V is required.

The V to F converter would be a welcome addition to a DVM module mounted on the front of the surrounding housing, the price of the DVM module installed for less than $ 20.00 can be.
The calibration of the transducer is preferably on board trimmer RV4 a small 10-turn trimmers and should have done, access to a frequency counter for precise adjustments but behind the associated low voltage transformer to the output, a rectifier diode and series resistance would be a 60 Hz signal for calibration. All other known source of the frequency within the specified range as the calibration square wave output to an oscilloscope can also be used.

headphone using op-amp circuit

Op-amp be tested as follows. (Almost all the Brow Brow ).

- OPA134 is OPA2132P OP-amplifier with a series CMOY Headamp a first OP amplifier used in all major DIY together.
- OPA637 op-amp is expensive to visit each other more western.
- OPA2111 op-amp, which is actually recommended by SEPK a barometer than a bad audio.
- OPA602 op-amp is recommended that listens well to the seller.
- Is NE5532 op-amp, cheap, but expensive audio is often used as a second class, the Thai new pot and possessed by us morally.
- TL071, 072 op-amp market, but 5532 sounds like 5532 is not to fight.
- OPA2107 friends recommended trying gadget 2111th Review
- OPA2227, 2228th
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OPA134, 2134, 132, 2132nd
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132,134 to a single op-amp 1 is the op-amp is only 1 in section 2132.2134 dual op-amp 1 is the op-amp has an internal 2nd
And audio version of x134 is x132 or x134 do with the building block of audio. Therefore, the bandwidth is narrower than the x132.

Voice of the x132, x134 is the op-amp the bass is very good bass.
If the sound is dense 2132pa other bits.
If 134,2134,2132 p sounds good enough to enter the relevant data .
The middle voice is a little off. (In order to avoid this is not นะ. How do you fight a different number) is not only the number.
If there is no distortion of the Class A Little Voice will narrow.
When taken to cycles Cmoy best dual op-amp because of the high flow rate.
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OPA637, 627
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Both figures are.
This op-amp that he the summit of the western front end is very prestigious.
With cycle times of trial and CMOY diamond and OP-amp is very wide, detailed sound image, without bias Class A.

The op-amp that sounds very natural. Listen to her concert dress very ครับ management.

However, an audio medium audio output. Thick, but not full battle cry. This is not good with middle-ear sensitivity, but if the Class A was the best ล่ะ ครับ sound. It sounds so natural as possible. Music that most of them are correct. Minimal distortion.

Another Best of the op-amp is the best deep bass.
Concluded that the price of taste. Everything is good frequency. John D. Bora detail.
But if they are taken to a central cmoy a little Badho, but if the Class A and above, and then op-amp.
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OPA2111.
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A dual op-amp.
Sound of 2111 focuses on the accuracy of the sound is very flat.
Personnel Group, does not sound rare. More precise definition audio. Small voice gently. Will go very clear.

Op-Amp is a very broad spectrum of sound from . But not good for much deeper. Listen first need to make it sound very narrow. But not really narrow. But if not deep Ota.

When helping the current cycle cmoy less, only buffer.

A socket has only eight legs only kp.
The BM is a steel chassis. Audio kp 30% is better than ever before.
(I try) not to be found.
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OPA602.
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There is no OP-AMP.
The op-amp that will not listen to again lose 637 more good no more, as well. But there are points marginalized. Made from the Echo.
All audio is to be installed with little response.
If you listen to jazz music and vibrancy of the sound. Make it even more so than  over 637 online casino in the chest, but found it to no end  promiscuous and do not have to leave.

Dimensional sound can sound good .

More and more reading, it was the beginning of the forehead forehead before 627/637 .
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NE5532.
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A dual op-amp market popular audio good cause.
Is not it hard to buy less expensive, but it has two degrees .
I accidentally try to have a good grade. The sound of good grades.
Husky voice is heard more clearly than in the same style, but is not specifically disclaims any clear.
But not so thick, the OPA family living.

NE5532 audio line to remove any broad thin bass sound stage Johor Sofitel Bora  good description either did not lose all the OPA.

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์ TL071, 072nd
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TL071 is a single version.
TL072 is a dual version.

This easy  to more than 5532 TV repair shop to purchase a rapidly changing any store.
The sound is close to the narrow end not more difficult, those who understand the op-amp op-amp was checking, but if the old one is put into your voice to put upward  555th

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์ NE5532.
************************************************** . ***********************.
A dual op-amp market popular audio good cause.
Is not it hard to buy less expensive, but it has two degrees .
I accidentally try to have a good grade. The sound of good grades.
Husky voice is heard more clearly than in the same style, but is not specifically disclaims any clear.
But not so thick, the OPA family living.

NE5532 audio line to remove any broad thin bass sound stage Johor Sofitel Bora  good description either did not lose all the OPA.

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์ OPA 2107th
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Op-amp is very good, it is a class for AP.

Central sound almost like 637 and not all open with a 637th
Medium soft, gentle voice like a trumpet pipe very detailed and deep and have good bass impact but  between 637 to 2132p.

But it sounds a bit mid-forward you do not agree, how to write each.
Writing, but I like to picture noise to hear and see well.

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์ OPA 2227.2228.
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Sounds a lot, but 5532 sounds a little more bold.
If the 5532-types are not good, virtually no .