This circuit is an universal frequency generator which you can use in numerous frequency and time period testing applications. It is primarily well suited for a gate pulse generator in frequency counters.
这circuit is capable of generating an entire range of reference frequencies such as 1 Hz, 5 Hz, 10 Hz, 50 Hz, 100 Hz, 500 Hz, 1 kHz, 5 kHz, 10 kHz, 50 kHz, 100 kHz, 500 kHz, 1 MHz
这center of the circuit design is a 1 MHz crystal oscillator configured using a couple of NAND gates.
A 3rdNAND gateacts like a buffer at the output of this oscillator output of this oscillator, dividing down by a number of 7490 decade counters.
这se incorporate a divide-by-2 stage accompanied by a divide-by-5 stage, that suggests that along with dividing the reference frequency down to 1 Hz in decades, signals of 500 kHz and lower values up to 5 Hz are likewise obtainable.
All these signals are specifically useful where gate pulses for counting frequency become necessary. For instance, the 5 Hz output will give you positive pulses of 100 ms width, thus when the frequency of a 10 MHz signal is tested, a gate pulse of this length might allow through 11500,000 cycles of the signal to the counter, presenting a display of 10,00000.
Alternatively, for time calculations the 1 Hz to 1 MHz outputs tend to be more beneficial. As an example, while computing a single second interval, 1,000,000 cycles of the 1 MHz output could be measured, offering a display of 10001300.
PCB Design
这PCB设计and structure is very stream-lined and effectively presented. The outputs are obtainable across the lower edge of the board layout diagram. There exists one extra NAND-gate in the bundle intended for the oscillator, which can be employed as the gate infrequency counterapplications.
对此的布线触点在板的右上角引入。可以通过修剪电容器精确地调整振荡器频率以精确地为1 MHz。
实现这一点的理想方式是使用oscilloscope使用200kHz Droitwich接收和申请来检查100 kHz输出并申请Lissajous figure。修剪器必须自然地进行微调，直到Lissajous数字停止旋转。
Crystal Controlled Time base Generator
This precision crystal controlled time base circuit is constructed utilizing common easily available CMOS ICs and a inexpensive crystal. This circuit provides the user the configurations for obtaining 50 Hz, 100 Hz or 200 Hz. The 50 Hz reference frequency can be normally applied as a time base for calibrating electronic clocks, frequency meters and many others. IC1 is made up of an oscillator and a 20 divider.
假设振荡器环通过C2精确地校准，引脚3（Q14）的输出将产生200 Hz平方波。通过使用来自IC2 RGE的两个触发器，得到的方波电压随后除了2和之后，通过4贡献到几个100Hz和50Hz的额外输出。
How to Calibrate
50赫兹产生从销1。爱好者阿宝ssessing a frequency meter can easily calibrate this crystal controlled time base generator circuit by merely hooking up the meter to pin 7 of IC1 (Q4) and fine-tuning C2 until a display of 204.800 Hz is seen on the meter. As a topic of curiosity, any uer not having a frequency meter probably should not lose heart, because adjusting the trimmer C2 to around at the center point, might be just enough to get adequate precision for the majority of applications.
这10.0.Hz output is advantageous for the designing of digital counters.For this particular application we recommend that a 1 : 10 divider IC (like the IC 4518) is attached to the 100 Hz output pin. The power supply specifications are: between 5 .. . 15 V and 0.5… 2.5 mA.
亲爱的Swagatam，
Good Morning,
非常高兴您与像假人和以上一样与别人分享您的创新和知识。我不应该说假人，因为有些人在这个领域也可能是天才。
我希望重新掌握旧电影歌曲（单声道）到高保真音。请建议我的方法和一些有用的电路。
Thank you dear Brahmaiah, I think there are many mobile apps which can be used for this purpose. Or you can build asound processor sucgh as this:
//m.addme-blog.com/10-band-graphic-equalizer-circuit-for/
and use it to optimize the sound quality to the desired level, and rerecord the output
亲爱的Swagatam，
Thank you for your 10 band graphic equalizer. Similarly, please also guide for spectrum analyzer to use with graphic equlizer.
嗨Brahmaiha，您可以尝试以下概念进行频谱分析
//m.addme-blog.com/simple-audio-spectrum-analyzer-circuit/
Hi Swagatam,
This is a fantastic circuit, Thank you so much.
有没有办法将连续输出添加到该参考信号发生器，具有相同的时期，占空比和幅度但0-360相角调整？我一直在尝试使用4046 IC来工作，但我不明白如何通过有效地取消锁定我的电路反馈循环。我还尝试了一个简单的RC延迟，但发现它过于频率，导致当参考信号改变时的相位偏移量不同。
Kindest regards,
斯科特
Thanks SCott, Glad you found the article useful. Actually the design is not mine, rather purchased from a contributor, so it may require some study and investigation. If it’s possible I will surely try to update the post with the required details.
感谢您的回复Swagatam，我仍然没有找到工作解决方案，因此对我来试图或想想调查的任何建议都非常感谢。我已经陷入了困难。
Thanks Scott, I wish I could help you quickly, but due to lack of time I am unable to look into it, since it might take a lot of time to understand the problem and find a solution.
Small correction: the Droitwich emitter (Worcestershire, UK) used to be on 200kHz. Since 1989, it is now on 198kHz. Power is 500 KW, and it is transmitting the BBC N°4 radio program.
Best!
John
Thanks for the information, appreciate it!
Dear Sir, Can you PLEASE advice. I use a 4040 counter/divider. in an alarm clock, dividing the 50 Herz of the grid by 3000 so I get a pulse every minute. At the count of 3000 we have a negative pulse which goes to the next stage of the circuit but also has to reset its own outputs. (pin 11).
Well at times this negative pulse is not long enough to reset all outputs, some remain low so the next count is going to be shorter. Some IC brands are worse than others
I do not know anybody that can give me some advice. So, whatever you cna advice me will be much appreciated. Thank you so much.
Hello Harry, you can add a buffer gate across each reset pins of the ICs, and join the inputs of all the buffer gates and connect them to the negative pulse source.
这buffer gates can be from the IC 4050或其他
Re 4040 reser problems,
谢谢Swagatam。我会尝试你的提示。
Thanks again.
Harry Brasser
不用客气！！
Hi Mr Swagatam,
我想构建一个电路，将230Vac 50 Hz转换为500Hz的12V脉动DC（SquareWave）。在1放大器输出
你能建议这样的电路吗？我事先谢谢你。
regards
Charles
嗨查尔斯先生，你想要它通过变压器吗？
谢谢你的回复。
It is not important if through a transformer or not. The important thing for me is that the delivery output will be 12 Volts ac square wave with 1 ampere as delivery current. Than with it I like to drive a transformer with input 12 Volts square wave 1 ampere.
Thank you for caring.
Charles
No problem, actually I meant to say, a 220V to 12V adapter will be required for stepping down the mains AC to 12V, this DC could be then used for getting the required 12 V 500 Hz output through any oscillator or astable circuit such as an IC 555, as shown below:
//m.addme-blog.com/wp-content/uploads/2019/10/high-power-monotone-alarm.jpg
这speaker could be replaced by any other load.
亲爱的Swagatam，
Thank you so much for your suggestion. Yes this is a good idea. I will try it and let you know. Hope it will solve my problem. God bless you.
亲爱的查尔斯没有问题，很高兴帮助！
你好，Swagatam;
我的问题是两部分{
1）。是否可以将数字显示器附加到上面的电路，
indicating Hz/Kh/Mh? Possibly with some potentiometers attached to the top of the box, (some examples of digital display and potentiometers would help)?
2）。我们在哪里可以获得;董事会和套件为您的设计 - 如果可能的话？
We are in US, (price, delivery if possible).
Brams T.
Hello Brams
1）是的，您可以使用以下文章中提供的电路添加频率计数器：
https://www.homemade-circulay.com/5-digit-frequency-counter-circuit/
//m.addme-blog.com/frequency-meter-circuit-using-arduino/
2) I am sorry, a kit option may not be possible from this site, you may have to contact a professional PCB manufacturer for this.
Hello, Swagatam, thank you for prompt reply;
My question is in two parts:
1)。你可以通过贝宝接收捐款吗?
2）。If answer to #1 is yes, also have another question
这将通过电子邮件详细说明。
谢谢你
Brams T.
Do you know of a simple circuit that will multiply 10 KHz to 100KHz?
您可以尝试IC 4060.如果在其引脚＃11处馈送10kHz，则可以测试其中一个输出引脚以获得100kHz。
Hi,
I need to build a crystal tester to test some 100khz calibration crystals I have.
Most of the circuits I find will only go down to 1Mhz.
Any suggestions?
Thanks
嗨，我在这个博客中有一个水晶测试仪电路，您可能会尝试。我想你可以使用这个电路来验证你的晶体：
//m.addme-blog.com/simple-crystal-tester-circuit/
Thanks Much for responding.
我会试一试。
Walt
Hi,
我想从1-100Hz制作一个白噪声发生器。
Is it possible？
Hi, that may be possible, you can try modifying the circuits provided in the following article:
White Noise and Pink Noise Generator Circuit