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Build A 10 Amp 13.8 Volt Power Supply Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers. The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack. It should be noted that there is no real cost advantage to building your own power supply unless you can get a large power transformer and heat sink for a super low price. Of course rolling our own gives us the ability to customize the circuit and make it even more reliable than commercial units. The circuit in Figure 1 will give us 10 amps (12 amps surge) with performance that equals or exceeds any commercial unit. The circuit even has a current limiting feature which is a more reliable system than most commercial units have.
Just like other commercial units, this circuit uses the LM723 IC which gives us excellent voltage regulation. The circuit uses 3 pass transistors which must be heat sinked. Resistor R9 allows the fine tuning of the voltage to exactly 13.8 volts and the resistor network formed by resistors R4 through R7 controls the current limiting. The LM723 limits the current when the voltage drop across R5 approaches .7 volts. To reduce costs, most commercial units rely on the HFE of the pass transistors to determine the current limiting. The fault in that system is that the HFE of the pass transistors actually increases when the transistors heat up and risks a thermal runaway condition causing a possible failure of the pass transistors. Because this circuit samples the collector current of the pass transistors, thermal runaway is not a problem in this circuit making it a much more reliable power supply.
The only adjustment required is setting R9 to the desired output voltage of anywhere between 10 and 14 volts. You may use a front panel mounted 1K potentiometer for this purpose if desired. Resistor R1 only enhances temperature stability and can be eliminated if desired by connecting pins 5 and 6 of IC-1 together. Although it really isn't needed due to the type of current limiting circuit used, over voltage protection can be added to the circuit by connecting the circuit of Figure 2 to Vout. The only way over voltage could occur is if transistors Q2 or Q3 were to fail with a collector to emitter short. Although collector to emitter shorts do happen, it is more much more likely that the transistors will open up when they fail. I actually tested this and purposely destroyed several 2N3055's by shorting the emitters to ground. In all cases the transistors opened up and no collector to emitter short occurred in any transistor. In any event, the optional circuit in Figure 2 will give you that extra peace of mind when a very expensive radio is used with the power supply.
The circuit in Figure 2 senses when the voltage exceeds 15 volts and causes the zener diode to conduct. When the zener diode conducts, the gate of the SCR is turned on and causes the SCR to short which blows the 15 amp fuse and shuts off the output voltage. A 2N6399 was used for the SCR in the prototype but any suitable SCR can be used. While over voltage protection is a good idea, it should not be considered a substitute for large heat sinks. I personally feel the best protection from over voltage is the use of large heat sinks and a reliable current limiting circuit. Be sure to use large heat sinks along with heat sink grease for the 2N3055 transistors.
I have used this power supply in my shack for several months on all kinds of transceivers from HF, VHF to UHF with excellent results and absolutely no hum. This power supply will be a welcome addition to your shack and will greatly enhance your knowledge of power supplies.
DE N1HFX Parts List
R11.5K ¼ Watt Resistor (optional, tie pins 6 & 5 of IC1 together if not used.)R2,R30.1 Ohm 10 Watt Resistor (Tech America 900-1002)R4270 Ohm ¼ Watt ResistorR5680 Ohm ¼ Watt ResistorR6,R70.15 Ohm 10 Watt Resistor (Tech America 900-1006)R82.7K ¼ Watt ResistorR91K Trimmer Potentiometer (RS271-280)R103.3K ¼ Watt ResistorC1,C2,C3,C4 4700 Microfarad Electrolytic Capacitor 35 Volt (observe polarity)C5 100 Picofarad Ceramic Disk CapacitorC6 1000 Microfarad Electrolytic Capacitor 25 Volt (observe polarity)IC1 LM723 (RS276-1740) Voltage Regulator IC. Socket is recommended.Q1 TIP3055T (RS276-2020) NPN Transistor (TO-220 Heat Sink Required)Q2,Q3 2N3055 (RS276-2041) NPN Transistor (Large TO-3 Heat Sink Required)S1 Any SPST Toggle SwitchF1 3 Amp Fast Blow FuseD1-D4 Full Wave Bridge Rectifier (RS276-1185)T1 18 Volt, 10 Amp Transformer
Merhaba
yukarıdaki devreyi yapıp çalıştıran veya çalışma mantıgını kavramış birisi bana yardımcı olabilirmi ben çıkışı 5-10 amper/ 5-15 volt aralıgında çıkış verecek bi dc devre yapmak istiyorum.Burda kullanılan 2N3055 ve 7805 entegresini kullanarak nasıl istedigim çıkışı alırım anlatabilirmisiniz.. örnekle açıklarsanız ve benzer bi devre varsa bildiginiz eklermisiniz.. ilgilenenlere şimdiden teşekkürler...
Merhaba
yukarıdaki devreyi yapıp çalıştıran veya çalışma mantıgını kavramış birisi bana yardımcı olabilirmi ben çıkışı 5-10 amper/ 5-15 volt aralıgında çıkış verecek bi dc devre yapmak istiyorum.Burda kullanılan 2N3055 ve 7805 entegresini kullanarak nasıl istedigim çıkışı alırım anlatabilirmisiniz.. örnekle açıklarsanız ve benzer bi devre varsa bildiginiz eklermisiniz.. ilgilenenlere şimdiden teşekkürler...
yukardaki devrede 7805 kullanılmamış olup eğer 7805 ile ayarlı olarak bir güç kaynağı yapmak isterseniz.orta bacağına bir potansiyometre ile saseye veriniz.15 volt giriş verdikten sonra çıkışınada 15 amper verecek kadar 2n3055 yada daha güçlü olan transistör bağlayınız.yapmak istediğiniz bu kadar basit fakat daha profesyonel yukardaki gibi bir devre tasarımı yaparsanız daha sağlıklı olur.
7805 ve tarnsistör kullanarak amper gücünü arttırmak
merhaba transistörleri kullanarak amper yükseltmek konusunda bilgisi olan varmı bu konu benim için çok önemli
7805 kullanacagım.
7805 e nasıl bi baglantıyla hangi transistorlerleri kullanmamı önerirsiniz...
eger formülünü biliyorsanız yazarmısınız ve örnekle açıklarsanız sevinirim.
Elinizde buna benzer çıkış veren isis de veya bi çizimi varsa eklermisini...
1-7805 entegresi için 5volt 10 amper için hangi transistorler kullanmalıyım...
2-7805 entegresi için 5volt 8 amper için hangi transistorler kullanmalıyım...
3-7805 entegresi için 5volt 6 amper için hangi transistorler kullanmalıyım...
4-7805 entegresi için 5volt 4 amper için hangi transistorler kullanmalıyım...
Not: kullanacagım 5vol yerine (5-15 volt) arası olabilir önerileriniz benim için çok önemli lütfen cevap yazın...
ilgilenenlere şimdiden teşekkürleri.... iyi çalışmalar...
isis kullanmadım ama yukarda gereken anlatılmış zaten çok basit bir sistemdir.delikli bir pertenaks üzerinde yapılabilir bu konuda bir kaynak bakacağım kaynağı buraya eklerim forumu takip ediniz.
Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers. The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack. It should be noted that there is no real cost advantage to building your own power supply unless you can get a large power transformer and heat sink for a super low price. Of course rolling our own gives us the ability to customize the circuit and make it even more reliable than commercial units. The circuit in Figure 1 will give us 10 amps (12 amps surge) with performance that equals or exceeds any commercial unit. The circuit even has a current limiting feature which is a more reliable system than most commercial units have. Just like other commercial units, this circuit uses the LM723 IC which gives us excellent voltage regulation. The circuit uses 3 pass transistors which must be heat sinked. Resistor R9 allows the fine tuning of the voltage to exactly 13.8 volts and the resistor network formed by resistors R4 through R7 controls the current limiting. The LM723 limits the current when the voltage drop across R5 approaches .7 volts. To reduce costs, most commercial units rely on the HFE of the pass transistors to determine the current limiting. The fault in that system is that the HFE of the pass transistors actually increases when the transistors heat up and risks a thermal runaway condition causing a possible failure of the pass transistors. Because this circuit samples the collector current of the pass transistors, thermal runaway is not a problem in this circuit making it a much more reliable power supply. The only adjustment required is setting R9 to the desired output voltage of anywhere between 10 and 14 volts. You may use a front panel mounted 1K potentiometer for this purpose if desired. Resistor R1 only enhances temperature stability and can be eliminated if desired by connecting pins 5 and 6 of IC-1 together. Although it really isn't needed due to the type of current limiting circuit used, over voltage protection can be added to the circuit by connecting the circuit of Figure 2 to Vout. The only way over voltage could occur is if transistors Q2 or Q3 were to fail with a collector to emitter short. Although collector to emitter shorts do happen, it is more much more likely that the transistors will open up when they fail. I actually tested this and purposely destroyed several 2N3055's by shorting the emitters to ground. In all cases the transistors opened up and no collector to emitter short occurred in any transistor. In any event, the optional circuit in Figure 2 will give you that extra peace of mind when a very expensive radio is used with the power supply. The circuit in Figure 2 senses when the voltage exceeds 15 volts and causes the zener diode to conduct. When the zener diode conducts, the gate of the SCR is turned on and causes the SCR to short which blows the 15 amp fuse and shuts off the output voltage. A 2N6399 was used for the SCR in the prototype but any suitable SCR can be used. While over voltage protection is a good idea, it should not be considered a substitute for large heat sinks. I personally feel the best protection from over voltage is the use of large heat sinks and a reliable current limiting circuit. Be sure to use large heat sinks along with heat sink grease for the 2N3055 transistors. I have used this power supply in my shack for several months on all kinds of transceivers from HF, VHF to UHF with excellent results and absolutely no hum. This power supply will be a welcome addition to your shack and will greatly enhance your knowledge of power supplies. DE N1HFX Parts List R11.5K ¼ Watt Resistor (optional, tie pins 6 & 5 of IC1 together if not used.)R2,R30.1 Ohm 10 Watt Resistor (Tech America 900-1002)R4270 Ohm ¼ Watt ResistorR5680 Ohm ¼ Watt ResistorR6,R70.15 Ohm 10 Watt Resistor (Tech America 900-1006)R82.7K ¼ Watt ResistorR91K Trimmer Potentiometer (RS271-280)R103.3K ¼ Watt ResistorC1,C2,C3,C4 4700 Microfarad Electrolytic Capacitor 35 Volt (observe polarity)C5 100 Picofarad Ceramic Disk CapacitorC6 1000 Microfarad Electrolytic Capacitor 25 Volt (observe polarity)IC1 LM723 (RS276-1740) Voltage Regulator IC. Socket is recommended.Q1 TIP3055T (RS276-2020) NPN Transistor (TO-220 Heat Sink Required)Q2,Q3 2N3055 (RS276-2041) NPN Transistor (Large TO-3 Heat Sink Required)S1 Any SPST Toggle SwitchF1 3 Amp Fast Blow FuseD1-D4 Full Wave Bridge Rectifier (RS276-1185)T1 18 Volt, 10 Amp Transformer Hammond #165S18 (Digi-Key HM538-ND)
Bu devrede kullanılan giriş trafosu amerikan şebeke geriliminde çalışan 110 volt trafodur.Türkiye standartlarında çalışmaz bu devre ,ama illede bu devre olacak diyorsanız seconder girişi 110 volt watıda 10 amper çıkışa dayanacak baba bir trafo olması gerekir.
elektronik devre önemli olan Trafosunu bulunduğunuz ülke koşullarında şeçebilirsiniz.burda önemli olan 18 volt çıkış verecek bir trafo olması yanı 220v giriş ve 18 volt ac çıkışa sahip olsa yeter