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The ar­ti­cle ‘Your Guide To Sol­der­ing’ by K. Bharathan pub­lished in May is­sue was very good and in­for­ma­tive.

Pra­jyot the link from where I can down­load th­ese cir­cuit di­a­grams. Anir­van Kolkata EFY: You may visit www.efy­magonline. com to pur­chase the re­spec­tive is­sues.

am­pli­fier Us­ing TDa2005M

In the ‘Gui­tar and Mi­cro­phone Am­pli­fier 8sing TDA2005M’ cir­cuit pub­lished in May is­sue, please note that:

1. De­pend­ing on the in­tended ap­pli­ca­tion of the cir­cuit:

(a) The value of C3 can be re­duced and se­lected in the range of 1-10 nF. This will re­duce sup­pres­sion of high fre­quen­cies from the mi­cro­phone.

(b) If elec­trolytic ca­pac­i­tors C2, C4 and C5 have high leak­age cur­rents, th­ese can be re­placed with non-po­larised ca­pac­i­tors of the same val­ues.

( c) The value of po­ten­tiome­ter 9R1 (2.5-kilo-ohm) can be re­duced to 100-680 ohms.

2. If switch S1 is opened, the mi­cro­phone is not pow­ered.

3. If the gui­tar does not have an in­ter­nal pream­pli­fier or buf­fer, the ca­ble be­tween the gui­tar and con­nec­tor CON1 should not be more than 1.8 me­tres long. —Pe­tre Tzv Petrov, the au­thor of ‘Gui­tar and Mi­cro­phone Am­pli­fier

8sing TDA2005M’

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