New BH Opening

I have not updated my blog for quite sometime because I was away for some other business.

Finally completed the BH conversion that written in previous post, just to share a short clip of opening, a quite satisfied result.




Few more projects coming next.

Audio Output Signal & Capacitor on Tweeter

We have often seen that tweeters used for the BHs commonly added a capacity to the positive terminal, actually many swiftlet farmers even consultants do not really know on what and how the capacitor functions. Since many readers are questioning about that I try to give a short brief on this topic per my understanding.

Before understanding about capacitor, first we need to know how the sound is being transformed and produced. Many of us would think that audio output produced by the player or amplifier is Direct Current (DC), because output terminal of amplifier normally coloured with Red and Black which we always misunderstand as positive and negative of DC.

In fact audio signal outputted from audio player is a complex AC waveform, when the volume is low, the voltage out is low. Volume can be increased by increasing voltage wave with an amplifier. We are controlling the output voltage by setting volume knob level of amplifier. Tweeter (speaker) is to transform audio signal from AC waveform into sound wave, that’s why reverse two cables, tweeter still produce sound but AC phase will be reverse.


We may commonly see that tweeters added a capacitor to (+) terminal, some farmer might understand from the tweeter supplier that capacitor is to help to balance the sound volume when number of tweeters are looped up in parallel circuit, which is not true. Some supplier may also tell you that tweeter with capacitor will improve sound quality.

A capacitor's basic function is to pass AC current and block DC current. A capacitor will never pass DC current, where DC could harm the tweeters. Capacitor can also limit AC current depending on the frequency when high surge. The proper µF of capacitor should be selected for your tweeter for its impedance (ohm).

Generally capacitor is a protection of tweeter especially dynamic type tweeters. However I personally don’t think it has significant function for those piezo tweeters in our BH. If you wanted to improve tweeters sound balancing I will advise to use low resistance audio cable and consistence impedance of tweeter. Nevertheless I am not sound engineer but just to share with readers from my understanding, anyone specialised in audio want to correct my statement or share something, you can email to me.

Headed to Ipoh for regular BHs inspection

I was heading north from KL to Ipoh to carry out regular inspection of my JV BHs yesterday, took about 3 hour driving to reach due to bad traffic condition.

These new BHs have been operating for few months only, there is some growth but not as good as those new BHs setup in populated area as expected, location is still the key factor of good success I always believe in. However the bird population can always grow bigger just matter of time as long as progressive, I am still quite satisfied in the progress of these BHs anyway, with some patience and good management they will turn into populated BHs in 2-3years time later.

Found a 3 eggs nest again in one of the BHs, seems birds like this particular BH and egg as many as they like.

昨天我从吉隆坡向北到怡保为我的合资燕屋进行定期检查，由于恶劣的交通状况，花了约3小时的车程才到达，。

这些新的燕屋运作了几个月而已，有一些增长，但并不像那些在燕子集密区的新燕屋成长来得好，这是在预料之内，地点仍然是非常成功燕屋的关键因素，但我始终相信燕群成长成集密区只是时间问题，但我仍然很满意了这些新燕屋的进度只要有继续的成长，一定的耐心和良好的管理，两三年后他们就会变成有生产力的燕屋。

这一次检查中，再次看到一个含有3颗蛋的窝，看来他们喜欢在这间燕屋放心产蛋。



After inspection done, managed to meet the producer of ‘Cool Mist’ in the evening, he made a demo and elaborated in detail and reliability of this product, which was impressive. He really put quite some effort and time in developing Cool Mist on perfection as well as cost reduction as compared to those equivalents ultrasonic humidifier in the market.

完成检查后，在傍晚时见了Cool Mist 的制作人，他做了其产品示范和详细其产品的可靠性。他真的花了相当长的时间和精力研发以及降低成本，和那些市场上等值超声波加湿器相比其价格相当合理。